what is this?

[derpers1]

please help. it is some sort of moss that floats on the top

[philip69285]

duckweed

[Wahter]

more info:

http://en.wikipedia.org/wiki/Lemna

Many aquarists consider this and bladderwort (Utricularia) to be pests in the aquarium.

http://en.wikipedia.org/wiki/Utricularia



Walter

[zamboniMan]

It's a pain to get rid of. Though lots of fish like it (killies for instance). I don't know if discus do better with it though I'm sure some one on here can tell us. I'm pretty obsessive about keeping it out of my tanks just because I don't like it.

[nikond70s]

yeah they can grow fast and get annoying and can clog up the filter intake. you should get something bigger...like the bigger floaters such as mini lettuce among other ones.

[mlw]

yeah had a really bad duckweed experience. It came in, just a few leaves, with some other plants I bought.

About three weeks later the entire surface of my tank was covered with the stuff. In the morning I would scoop it out by the netful and it seemed by the time I got home from work it had multiplied and covered the surface again.

Other plants suffered because there was no light reaching them.

It took me a really long time to finally get it all out of the tank.

[zamboniMan]

Yeah I wash any and all new plants very thoroughly and then put them in my QT tank for a few weeks so as not introduce duckweed and/or new algae.