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  1. #1

    Default All my duckweed and frogbit died

    0 Not allowed!
    All my duckweed died within 3 days - it's not rotten or anything. There are some pale brown particles left but the rest of it is just *gone*. The frogbit is mostly gone as well but I have some healthy-looking mini water lettuce. My other plants are all growing well.

    I also lost a black neon tetra last week and one of my new panda corys this week. Everyone else - neons, pygmy coryes, guppies, kuhlis, Otos, shrimp seem to be thriving.

    Parameters are fine - 0, 0, 40 (pre-weekly 30% water change).
    PH stable at 8.2 (API liquid high PH test)
    Hard water.

    Could something have eaten the duckweed?
    My tank seems perpetually HUNGRY - any food gets devoured within seconds, all I ever find of a dead fish is a spine (yuk!), usually because a shrimp is dragging it around (yuk!) ... I feed twice a day in small quantities and the morning before WC I tend to give a "bumper" feed of a couple wafers to make sure all the bottom dwellers are well fed too.

    My nitrates seem high enough that I can't imagine the duckweed died through starvation, but looks like I'm the only person t ever kill that weed ... and I wanted to have it!
    50g planted: 8x guppy/endler hybrids, 8x black neons, 8x kuhli loaches, 3x otos, 4x pygmy corys, 4x panda corys, 4x neons, Assassin snails + cherry & Amano shrimp

  2. #2


    0 Not allowed!
    I have no clue, but I thought duckweed was one of those plants that you just can't kill! just sort of disappeared from the tank?
    10 Gallon Beginner Tank... Journal

    40 Gallon Breeder: ... Journal

  3. #3


    0 Not allowed!
    Quote Originally Posted by Slaphppy7 View Post
    I have no clue, but I thought duckweed was one of those plants that you just can't kill! just sort of disappeared from the tank?
    Yup it just disappeared. I even checked out the canister to see if some freak in-tank storm sucked it all away .. but nope. All gone.

    Everyone says it can't be killed. Apparently, if you want to get rid of it, just ask me to look after your tanks for a couple weeks! (there's none in my garden pond either. I actually collected the stuff to put in my tank because I like the shade it provides lmao). It had been there about 2 months, alongside the frogbit.
    50g planted: 8x guppy/endler hybrids, 8x black neons, 8x kuhli loaches, 3x otos, 4x pygmy corys, 4x panda corys, 4x neons, Assassin snails + cherry & Amano shrimp

  4. #4


    0 Not allowed!
    Now that is really strange...
    10 Gallon Beginner Tank... Journal

    40 Gallon Breeder: ... Journal

  5. #5


    0 Not allowed!
    I had this same thing happen to me. When my ten gallon was set up I bought some frogbit for it. There was enough to cover about 2/3 of the surface. It seemed to do well for about a month and then literally over the course of 2 or 3 days it disappeared. There was no dead plant material, no change in water parameters and the only fish were neon tetras.

    It was as if it just dissolved.

    I just assumed that my lighting was inadequate and that must have had something to do with it.
    10 gallon live planted aquarium with 6 neons
    90 gallon fw community in progress

  6. #6


    1 Not allowed!
    The Case of the Disappearing Duckweed
    10 Gallon Beginner Tank... Journal

    40 Gallon Breeder: ... Journal

  7. #7

    Join Date
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    1 Not allowed!
    Frogbit does need a good bit of light, but duckweed will grow with nothing more than a regular fluorescent strip light IME. Plenty of fish will eat it, but I don't see any on your stock list that seem likely to. I have seen it get trapped under ornaments or driftwood when the flow from a hob filter carries it deep enough, but it's more likely to clog the intake than get sucked into the filter.

    ^^^^Please click the eggs/dragons, thanks.

  8. #8


    2 Not allowed!
    I have also read duck weed doesn't like a lot of flow, but I have no first hand experience with it. You might want to look into that.

    I would also suggest increasing your weekly water changes as you have very high nitrates. That could have be a factor in your recent fish losses.
    If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease.
    "Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony Calfo
    Fishless Cycle Cycling with Fish Marine Aquarium Info [URL=""]

  9. #9


    0 Not allowed!
    I am a bit guilty of over feeding as I always worry about the bottom dwellers. And I'm probably guilty of overfertilising too to keep the plants happy. *big sigh!* ... I was doing two weekly WC but kept getting BBA. Was advised on the plant forum to reduce WC ... and indeed the BBA has totally stopped. Can't win!

    Flow could be an issue. My filter moves 1400L per hour ... in 200-ish L tank. I was told to go for 10x times the volume due to the heavy planting in the tank. And I have an additional power head as well to keep things circulating. So that probably explains the floating plant deaths. I do have a corral for the floaters, but I guess it doesn't offer much protection to the smaller plants.

    You can see my floating corral in this pic.
    50g planted: 8x guppy/endler hybrids, 8x black neons, 8x kuhli loaches, 3x otos, 4x pygmy corys, 4x panda corys, 4x neons, Assassin snails + cherry & Amano shrimp

  10. #10

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    1 Not allowed!
    heres my theory, fungus. being half in water and half out floating plants are very susceptible to the smallest infection of fungus. and i happen to know that of the floating plants flogbit and duckweed are the more susceptible of the common floaters. it has something to do with the matrix of their plant cells and such. if you want to try and save what little frog bit you have left i would splash them around a 1ml/gal (or 1ml/400L) of hydrogen peroxide to water for about 10 mins. then rinse good in old tank water or just dechlorinated. maybe repeat this with your water lettuce too. but im not sure how well they hold up to the treatment.

    what cliff was say is completely true, all floaters like frogbit/duckweed will die with too much flow. i know this by experience. but that should only apply to surface flow not tank flow.
    I wonder if i plant one of my tiger barbs would the demon seed grow to a full tree?
    gotta love them bunnies!
    I.R.S.: We've got what it takes to take what you've got!

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