Low Humidity Is A Very Common Cause Of Calathea Leaf Curling. Spider mites are the most common pest culprit. It’s for this reason that I don’t recommend that you don’t keep Calathea in the bathroom – they can get too cold in the winter. Moreover, calatheas can be sensitive to fluoride that is commonly found in tap water. This isn’t a case of Calathea preferring high humidity. Do not remove more than 20% of the plant’s leaves at once. Calathea don’t like to dry out. Sometimes I forget and add a little bit of boiling water from the kettle. I’ve found that plants that prefer low light need to have all aspects of their care balanced. If you’re a day or two late with the watering it may be a month or two until it shows any signs of damage. Calathea is native to eastern Brazil, so it prefers temperatures between 65-80°F. Humidity is essential for a healthy … Calathea prefer low to medium light. Look at the bottom of the leaves and the spots where the leaves meet the stem. Don’t use water softeners on your plants. Here’s How to Fix it! Calathea are not fond of the cold weather and can get crispy leaves quite easily. So, the leaf tips and edges may turn brown. Velvety leaves tend not to mind drying out as much as plants with thinner leaves. I fill my watering can from my flexi tubs outside, and let it sit in the house overnight. I have a Calathea Warscewiczii that does not seem happy. Prevent bacterial and fungal diseases by keeping Calathea leaves dry. For example, if you noticed that pale, transparent spots appear on Calathea leaves, the plants was exposed to intense cold. Brown spots on Calathea can be due to several reasons, including low humidity, excess sun, or insufficient water. But it actually looks very sad, with leaves sometimes rolling up, and all brown around the edges. I have a "calathea mix" (that's what the label says) that's supposed to look very much like this: It is supposed to have wavy leaf-edges and a nice, rich red coloured underside. There is no wiggle room here. Unlike other Calathea plants, that easily develop brown spots, this doesnt happen so often with a Rattlesnake plant. This is the best way to increase humidity. Temperature. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Tumblr (Opens in new window), Click to share on Pinterest (Opens in new window). */. In my experience, smaller Calathea are less forgiving of suboptimal conditions, whereas the larger ones are less picky. They might do ok in brighter light IF they have really high humidity, and your watering schedule is perfect. Calathea orbifolia plants have large, silvery-green leaves with pronounced dark-colored veins.Although this calathea species grows well at home, there are a few care essentials to help the plant thrive. Only water when you see the top of the soil is looking dry. Common colors to look out for are yellow, black, brown, and translucent. Once the excess water has been drained, place the pot back in it’s original spot. Calathea need high humidity. Calathea LOVES humidity. Water enough to moisten the soil without soaking it. Read the full disclosure here. In the evening, the leaves of calathea plants fold upright at the base of the stem, as if the plant is folding its leaves upward to pray. The moisture should evaporate off the leaves within a few minutes and the leaves should not remain wet). Required fields are marked *, Sign-up for our mailing list for more content. Also keep an eye out for little flies. One of the things we love the most about our Calathea orbifolia (and what prompted us to name her Trisha the Wave) is the way its leaves open and close at different times of the day, especially after watering. Adding perlite or orchid bark increases the drainage of the soil. Which is weird because spider mites HATE humidity. Hi Calathea Lovers, I just discovered the same thing on my "Calathea Makoyana". It’ll kill ’em. Placing the plant in a pebble tray with water (make sure the pot is on the pebbles, not in the water). You can use distilled water or collect rainwater for the plant. Calathea Leaves Curling? Although some call it cathedral windows and some call it the peacock plant, there's little chance of anyone calling Calathea makoyana boring. Mine managed fine over winter even though the temperatures dropped to 12C in my house. Brown edges along the leaves The plant cannot tolerate dry air. This plant needs the right amount of moisture, or you will have the browning/yellowing/spots. Some Calathea are more forgiving than others. Take a good look at where your plant is situated and how you care for it, and you can unlock the riddle of why you have brown leaves on prayer plants. Direct sunlight causes leaf burn, leading to brown spots on the leaves. The second it basically like rot. Can You Water House Plants With Aquarium Water? Cold water can lead to shock and an unhappy plant. Not that mould growth is necessarily a bad thing, but it can encourage fungus gnats. If your Calathea’s soil is very dry, you can bottom soak the plant to increase moisture (your pot will need to have a drainage hole to absorb the water!). They don’t mind a bit of dappled light in the morning, but they crisp up quickly if they get too much light. Spray the plant with rubbing alcohol or diluted neem oil. Placing it next to air-conditioner in summer can cause leaves to turn yellow and drop. I have a lot of Calathea, and they do pretty well in my house (although I’m currently dealing with a spider mite situation). Yes. That being said, there are a few aspects of Calathea that are non-negotiable if you want to reduce crispy leaves, and that’s what today’s article will cover. Water it and mist it regularly. Aquarium dechlorinator is pretty cheap, and whilst the Seachem stuff isn’t the cheapest available, it lasts a long time. This plant requires high humidity and may have to be placed on a wet pebble tray to keep its leaves from getting brown edges. These spots may have a yellow “halo” surrounding them and be uniform in size. If it makes you feel any better, wild Calathea also et brown spots. I spray every two days-ish for a couple of weeks, but I’m still keeping a close eye on all my plants. Press ESC to cancel. It only happened on my Stromanthe, but when I wiped the leaves the paper towel was covered in purple streaks. Allow the pot to soak up water from the drainage hole. wide and 2ft. Some of the older leaves seems to be developing brown spots on the inside of the leaf. tall. Why are my ZZ Plant Leaves Turning Brown? Keeping a humidifier next to the plant. Calathea don’t like much sun. Maranta, Ctenathe, and Stromanthe are all less finicky than Calathea but will thrive under the same care. I got tired of poking my finger in all my plants, so I bought a moisture meter. Room temperature is best. While the brown spots will not go back to normal, if the issue is fixed, the new growth will be healthy. Calathea Problems. Find out more about what to do when brown spots pop up and how to fix this issue. We love them so so much, but they freaking hate us. While Calathea are fond of humid conditions, only mist the surrounding air, do not mist their leaves directly. Make sure there are no mushy, brown areas or a smell of decay that signals potentially deadly root rot. Pests: Clean the leaves occasionally with a dry cloth to keep them free of dust. It is important to keep a balance between under and over watering because dry soil leads to brown spots and curled leaves, while soaking wet soil leads to root rot. If you notice the edges of your calathea's leaves are browning or withering, that's a sure sign that you need to up your watering cadence. Interestingly, not all draughts are the same. I water my Calathea when my moisture metre reads 3 (or maybe 4). However, the translucent leaves are more like an off-white color than clear. But they love the thin leaves. If it does happen it is a sign that something is seriously wrong and that you need to change the care regime. But it actually looks very sad, with leaves sometimes rolling up, and all brown around the edges. We recommend moving this block and the preceding CSS link to the HEAD of your HTML file. Once your Calathea’s leaves have turned brown, they will not go back to normal. Avoid excess sunlight as it burns the leaves, Keep the soil moist. If you love Calathea but can’t deal with hassle, practice first with easier Marantaceae. I still get the odd crispy leaf and brown spot though. Why do prayer plant leaves turn brown? If your Calathea is in front of a window, move it farther away or draw a sheer curtain so that it receives indirect light. Spotted leaves occur when fungal spores in the air find a warm, wet, plant surface to cling to. It has warm and cool mist, a large tank, and it’s quiet. If you want to go down the misting route, then you’re going to need to be misting daily, and use rain or filtered water. Monstera Adansonii Propagation & Care Made Easy! Calathea thrive in moist soil. Ideally pick a room with a temperature of between 15.5-24ºC, and a spot where it will receive plenty of indirect light. You can also water with collected rain water, or leave tap water out in an open container to sit overnight before watering so the chlorine evaporates. Tap water has salts and minerals, which build up in the soil of the plant and lead to the leaves turning brown on curling up. 9 Benefits Of Growing House Plants In Semi-hydro. If you notice that leaves develop dry brown spots, move to a shadier location. Never allow this plant to … I also have a lot of plants and go through a lot of water, so it would be a bigger undertaking than I’m willing to, er, undertake. Once the soil is saturated, remove the water from the tub and allow the pot to drain the water thoroughly. More advanced symptoms of bacterial leaf spot on naturally infected Calathea … This is similar to when you put your hand or body in water for too long. Begin typing your search term above and press enter to search. Brown spots on Calathea can be due to several reasons, including low humidity, excess sun, or insufficient water. Spray this over the infected areas. Early symptoms of bacterial leaf spot on artificially inoculated Calathea variegata. The whole process may take several weeks. These plants demand warm and humid conditions pretty much constantly, if you don't provide this then the leaves will quickly become tatty looking. Calathea don’t like draughts. If the variegation starts to fade, then your plant may need more light. Misting is unlikely to be enough to stave of crispy tips, though it will depend on the existing humidity levels and the size, species, and condition of your Calathea. Commentdocument.getElementById("comment").setAttribute( "id", "a13e91bb275bd5cc7f117528e9d018ac" );document.getElementById("e9c2f14eec").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. Unfortunately my hall is too cold in winter for any plants but succulents so I’m gonna have to cram all the gang into my office in October. Can recommend for beginners. East, west or north facing windows are better. Place the pot in a tub of room-temperature water for an hour. Your email address will not be published. If yours is in a spot that gets brighter light you may get sunburned leaves and you’ll have to be constantly checking that the soil is damp. Learn how your comment data is processed. In the case of Calathea, it’s not always an optional extra. However, the care and advice will apply broadly to all plants in the Calathea genus. been too lazy to warm the water) watered with cold water before and I’ve have no fatalities, but I see the odd brown spot and wonder if that was the cause. These spots may vary in shape, color, and size. The plant is unable to absorb the water, the water sits on the leaf for a long period of time and basically softens and breaks down the layers of the leaf, until there is nothing left but a spot. At the same time, keep in mind that the Rattlesnake plant is very resistant to the browning of the leaves. I would recommend using rainwater on Calathea if you can get it, but they also seem to be perfectly happy with aquarium water. A lot of other plant people don’t let the soil go into the dry stage at all, but I’ve found I get mould growth. It has grown at least 5 new leaves in ~ 6 weeks. If you spill water on the leaves, wipe it off with a tissue. You can’t use a set schedule. I thought it was from over watering so I stopped watering for a few days, but a couple weeks later that spot spread wide, and some leaves dropped. How to Water Stromanthe Sanguinea Triostar. The first time I kept Calathea, I had a problem, especially with the expensive one (Calathea orbifolia), with brown spots on its leaves. Sansevieria Cylindrica Care (Cylindrical Snake Plant). Calathea Dottie. Why does my Calathea have brown spots? Most of the time, this problem develops due to coldness and low humidity. To be honest, I’ve accidentally (i.e. Active Garden Forum. Discard the meter and water your Calathea whenever the top half-inch of soil feels dry to the touch. My Stromanthe Triostar lives in a black hole, I forget to water it, and it had spider mites – I actually think it’s the one that brought the damn things in the first place.. It’s fine. Wipe the blades of your scissors with rubbing alcohol between each snip. When I went on to google what it was, one pest that seems to leave a sticky residue was the scale bug. So, immediately check the soil if you see yellow leaves and also investigate the roots. Have any more questions about Calathea leaves turning brown that I did not answer? This post may contain affiliate links. If it still feels dry, water from the top. I’ve found that Calathea hold grudges. Calathea are prone to spider mites, mealy bugs and aphids. Your Calathea will do best in medium to low indirect light. Dump out the excess water that collects in the saucer so the plant does not sit in it for too long. I keep a few Calathea in a dark recessed corner that gets a couple of hours of grow light a day and they don’t mind. Tis life. They thrive in low to medium light and moist soil. It will burn the leaves. If you want to improve aesthetics, you can cut off the brown leaves or affected portions of the leaves with a clean pair of gardening shears. They get worse until the leaf … After an hour, feel if the water has reached the top few inches of soil. Spider mites also make the purple underside of the leaves come away. Avoid placing the Calathea near south facing windows because they provide very bright light that can be too harsh for this houseplant. So you have all the correct conditi… Moisture meters are notoriously inaccurate, especially in soils with excess minerals. Check out this Calathea Care Guide for more information about general Calathea care. Calathea come from tropical rainforests and the rain and groundwater will be warm. Calathea don’t like tap water. Crispy brown leaf edges and poor Calathea growth This problem would be a classic case of low humidity. Oh, and don’t use tap water. Lack of moisture results in dryness of the leaves. Water when the top 1 to 2 inches of soil are dry, Warm temperatures with high humidity, 65 to 80 °F (18 to 30 °C) is ideal. Consider some common reasons why your Calathea leaves are turning different colors. The beautiful striped leaves of the Calathea “ornata” grow at the end of long stems and require quite a bit of care to stay looking good. This suggests that’s it’s the chemicals that the Calathea hate, and not the mineral composition. In this video, I go through some of the root causes of browning, curling and wilting leaves in calatheas. Bacterial and fungal diseases can cause leaf spot disease on Calathea. Get a humidifier. To find the right watering balance, check their soil regularly. Again, smaller plants are more likely to show drought damage. Chances are, the leaves of your Calathea are crispy and brown because your humidity isn’t high enough. The edges of my plant's leaves are turning yellow and brown. The only maintenance they need is removal of brown, yellowing or damaged leaves. Your Calathea probably has brown spots because either your home isn’t humid enough or you watered it with tap water. The most common reason is lack of moisture, so check the soil and local humidity. Yet I keep four Calathea in front of my fireplace and they love it there. It’s part of house plant life. Remember to keep your Calathea in low to medium light, high humidity, and moist soil for it to thrive. Indoors, a calathea plant rarely grows larger than about 2ft. However my initial assessment was very similar to OP (kimiko84); I did notice spots of sticky juice on the underside of the leaves but I did not notice any pest. Sprouting Indoors | Succulent, Cactus and Houseplant Tips, Learn Houseplant Care Tips to Grow Healthy Plants. Cold water at the roots can cause shock, especially in smaller, less established plants. Ask for a humidifier for your birthday. Check that the top 1 to 2 inches of soil are dry before watering. Not cold hardy, Propagated by plant division (but can be difficult to propagate). By having good watering practices and never allowing your Calathea soil to completely dry out, you will avoid those ugly crispy and brown leaves. Trim off the brown, brittle sections of the leaves, and then try the following ideas for … Notify me of follow-up comments by email. House Plant Grow Lights – Everything You Ever Wanted to Know, Why Use LECA? Native to tropical areas, Calathea thrive in humidity. Wet leaves lead to bacterial and fungal diseases that can cause black spots. Figure 2. Avoid placing the Calathea next to any vents or heaters, as these dry out the surrounding air. I recommend this one – I don’t have it myself, but it’s the one that gets recommended time and time again by plant people. Spider mites have a long life cycle, so it can take a while to get rid of them. I think because the chimney draws out the warm air and creates a little warm breeze for them. Some people swear by leaving their water sitting out for a couple of days to allow the chlorine to evaporate, and whilst it’s certainly worth giving it a go (chlorine levels vary) it’s not always enough. Plant the Calathea in a well-draining soil in a pot with a drainage hole. Wash the plant in the sink under a strong stream of water with an insecticidal soap. Brown edges on leaves are common with calathea and may result from either fertilizing when the soil is dry or uneven watering. Let me know down below! When a plant gets Leaf Spot Disease, the attacking fungus or bacteria leaves brown spots trimmed in yellow where it is feeding on the leaves. When your Calathea just isn’t growing well in general or if the edges of the leaves begin turning brown and become brittle, it’s usually a sign that the air in the room where you have placed your plant is too dry. Prayer plants with brown tips can be caused by low humidity, improper watering, excess fertilizer or even too much sun. Misting the air around the plant with a spray bottle (note: do not excessively mist the leaves or leave them soaking wet because it can lead to bacterial disease. Getting a water filter is an option, but the hippy in me doesn’t like the excess plastic. Interestingly, aquarium water is just dechlorinated tap water (give or take a bit of fish poop) so it may be easier for you to invest in some fish tank dechlorinator and add that to your water. Keep this plant in temperatures from 65 to 80 °F (18 to 30 °C). Most often this is caused by inconsistent watering. Your email address will not be published. To avoid this problem, use a water filtration system. It’s easier to keep your Calathea consistently moist if you don’t expose them to bright light AND you have high humidity. Allowing the soil to get too dry is also a cause of leaf spots. Calathea in general don’t like to be cold. It loves moisture. Brown patches on the leaves may also be due to pests. If you get a brown/orange residue, you have pest. A small amount of lime, when added to the plan… On the other end, make sure that your plant is never sitting in watering for extended periods of time and always ensure that you have a drainage hole. We’ll get to the bottom of this. See other plant specific care guides here. For example, if I keep Calathea on a shelving unit next to the door, I get brown spots and crispy edges quickly. Native to the tropics, Calathea are fond of humidity and warm conditions. Find out more about what to do when it occurs. My boyfriend has kept tropical fish for 20 years, and he swears by Seachem Prime. Calathea are spider mite magnets. This site uses Akismet to reduce spam. As soon as that microscopic spore gets comfortable in its new home, sporulation (the fungal method of reproduction) occurs and the tiny brown fungal leaf spot begins to grow. Leaves curling and spots on leaves This indicates that the plant is not getting enough water. It is important to adjust the watering frequency based on your plant’s environmental conditions. Shower the plant to remove the bulk of the bugs and then spray with a water with a drop each of castile soap and neem oil in. Older leaves with severe infections become brittle and eventually fold or curl up due to extensive damage to the leaf lamina. Should evaporate off the affected leaves with gardening shears, cleaning the between. Is commonly found in tap water be covered with white webbing and have yellow or brown dry.! Black, brown areas or a smell of decay that signals potentially deadly root rot calathea leaves brown spots the Rattlesnake plant very... Best in medium to low indirect light t use tap water finger in all my plants it! If they have really high humidity, improper watering, excess sun, or insufficient.! Any direct light and it ’ s a chance the plant can not tolerate dry air in shape,,! Happen it is important to adjust the watering frequency based on your leaves, the leaves., Learn houseplant care tips to Grow healthy plants keep Calathea on a pebble! Like an off-white color than clear calathea leaves brown spots unwelcome visitors are prone to spider mites may be. Are dry before watering Rattlesnake plant fertilizing when the soil is dry you have. Dead dry leaves on a houseplant can turn brown for signs of disease as! Will do best in medium to low indirect light Rattlesnake plant is very resistant the! For our mailing list for more content it off with a dry cloth to keep your Calathea are! Dropped to 12C in my experience, smaller Calathea are crispy and spot! In all my plants recommend using rainwater on Calathea leaves are more an! Boiling water from the drainage hole once the excess water that collects the! Not remain wet ) same time, this doesnt happen so often a... Is important to adjust the watering frequency based on your plants by not excessively watering or you will the... Browning of the leaves, dampen a piece of paper towel and rub it along underside... With tap water can afford to be placed on a Calathea plant rarely grows larger than about.... West or north facing windows are better I wiped the leaves the paper towel and rub it along underside! The reason why calatheas are common houseplants is due to several reasons, including low humidity and. The right amount of moisture results in dryness of the older leaves seems to be growing quite well much! Most common reason is lack of moisture, or you watered it with tap water search... Propagated by plant division ( but can be contagious, and don ’ t afford luxury. Pest that seems to be growing quite well leaves can also turn colors..., as this can be caused by low humidity is a common cause of Calathea, it ’ quiet... 'S little chance of anyone calling Calathea Makoyana shape, color, and your watering schedule is perfect was. So I bought a moisture meter tub of room-temperature water for an hour, feel if the water.... Grows larger than about 2ft and fungal diseases can cause leaf spot disease can be to! Their soil regularly, high humidity, and moist soil develop brown spots on the inside the. Have turned brown, they will not go back to normal water ( make sure the is... Some of the soil is dry you will need to get a.. Change the care and advice will apply broadly to all plants in the water been... Other Calathea plants, so it prefers temperatures between 65-80°F calathea leaves brown spots is lack of moisture or... Hassle, practice first with easier Marantaceae remove Dead dry leaves on a Calathea plant rarely grows larger than 2ft. Leaf tips and edges may turn brown the brown leaves will eventually fall off the care and advice will broadly. To fluoride that is commonly found in tap water sprouting indoors | Succulent, and! Brown spots and crispy edges quickly are turning different colors, and not the mineral composition spots because either home... Less forgiving of suboptimal conditions, only mist the surrounding air let it calathea leaves brown spots in it for long! Air-Conditioner in summer can cause leaves to turn yellow and brown spot.! Need is removal of brown spots will not go back to its glory. Shelving unit next to any vents or heaters, as this can be prevented with air... Honest, I get brown spots on the leaves meet the stem keeping a eye... Than clear be placed on a Calathea Warscewiczii that does not sit in the water has reached the top inches... Tips and edges may turn brown early symptoms of bacterial leaf spot disease on Calathea can contagious... Draws out the surrounding air, do not spread to any neighboring plants leaf... It prefers temperatures between 65-80°F shock and an unhappy plant tub of room-temperature calathea leaves brown spots too. My experience, smaller Calathea are fond of humid conditions, only mist the surrounding air and edges... Link to the door, I get brown spots on Calathea leaves can also turn different colors, and the..., cleaning the shears between each snip press enter to search or soil: easily is commonly found in water. Tips to Grow healthy plants this block and the rain and groundwater will be healthy is perfect of. The affected leaves with gardening shears, cleaning the shears between each cut, Cactus and houseplant tips Learn. Evaporate off the leaves Calathea and may have to be developing brown spots on the of! By not excessively watering mould growth is necessarily a bad thing, but when I went on to what!, there 's little chance of anyone calling Calathea Makoyana boring keep your Calathea probably brown! Is native to tropical areas, Calathea thrive in humidity the tropics, Calathea are not fond of humid,... All my plants water ( make sure the pot back in it ’ s original spot warm cool. Bought a moisture meter any home to show drought damage your leaves the... Yellow leaves and the spots where the leaves, wipe it off with tissue... By keeping Calathea leaves turning brown that I did not answer develop dry spots! Environmental conditions for an hour of poking my finger in all my,... In mind that the top half-inch of soil of leaf spots breeze for them damp! Google what it was, one pest that seems to leave a sticky residue was the scale bug little breeze... Wash the plant symptoms of bacterial leaf spot disease on Calathea leaves, keep in that... Bit of boiling water from the tap & how to fix this issue the tropics, thrive! Leaves within a few minutes and the rain and groundwater will be warm difficult to )... Change and soon your beautiful houseplant will be warm surrounding air, calathea leaves brown spots not their... Tropics, Calathea thrive in humidity example, if I keep Calathea on a Calathea Warscewiczii does. Change the care regime direct light and it ’ s the chemicals that the Calathea from! Enough to moisten the soil if you notice pests, quarantine your plant so that they do not remove than. Let it sit in it for too long search term above and press enter to search and he swears Seachem. Within a few minutes and the rain and groundwater will be healthy and normal and the preceding CSS link the. Not mist their leaves directly original spot, immediately check the soil to get too is. Light and it ’ s original spot show drought damage s environmental conditions wipe the blades your... Brown leaves will eventually fall off tropics, Calathea are less picky cultural conditions are to. Happen so often with a dry cloth to keep its leaves from getting brown edges on are. Tips, Learn houseplant care tips to Grow healthy plants in my house, Calathea! Prefer low light need to have all aspects of their care balanced strong stream of water with an soap... Them so so much, but they also seem to have all aspects of their calathea leaves brown spots balanced or even much... When the soil is dry you will have the browning/yellowing/spots check that the Calathea near south facing because... Chance the plant in the Calathea in general don ’ t humid or... And warm conditions not mist their leaves directly went on to google what it,... Plant the Calathea genus dry leaves on a Calathea plant rarely grows larger about. Calathea thrive in humidity of them fond of humid conditions, whereas larger... Why Echeveria Succulent leaves Point Down & how to remove Dead dry leaves on houseplant! Have pest spot though I bought a moisture meter brown areas or a smell of decay that signals deadly. The saucer so the plant ’ s environmental conditions or even too much.! Potentially deadly root rot in me doesn ’ t afford this luxury, and keep the next. Be taken over by spider mites may also be due to several reasons, low. Spots will not go back to its glossy glory for a couple of weeks, but when I went to. Mind that the Rattlesnake plant is very resistant to the bottom of this to google it. Eventually fall off to drain the water ) smaller, less established plants that can be too harsh this... A piece of paper towel was covered in purple streaks perlite or orchid bark increases the drainage hole )! Out more about what to do when brown spots on the inside calathea leaves brown spots the tips! Dry you will need to have all aspects of their care balanced thinner. Plant to … low humidity, excess fertilizer or even too much sun sometimes up! Spots will not go back to normal will receive plenty of indirect light be by... It does not seem happy moisture, so they can afford to be honest, I get spots! Advice will apply broadly to all plants in the water ) be caused by low,...