Small worm-like animals swimming around.

[mpecarevic]

Does anyone know what they are?
They are about 2 - 4 mm long, and maybe 0.5 mm thick.

 

[flamingonhot]

Nematodes.

harmless and even provide a snack for smaller fish. No need to worry unless you hate the look o fhtem.

When I had some they had thousands of babies and I couldnt stand the site, if they're with small fish like guppies they'll get eaten right away.

 

[mpecarevic]

.

Actually they are with neon tetras.
Do tetras eat nematodes?

 

[Friendly]

I've had little worms appear in one of my tanks before. Sometimes they just float around in the water. When I got some Neon Tetras, the Neon's would eat them. I'm sure they will disappear after a while. I have no idea where they come from though.

 

[mpecarevic]

Thanks a lot guys.

 

[mpecarevic]

Thanks a lot guys.

 

[Devilishturtles]

Nematodes and free swimming planaria are caused by an overabundance of nutrients in your tank. Usually from overfeeding or underfilter/vaccuming. Make sure you keep up on regular maintenence, and you should see them go away. They can become quite unsightly, but are harmless.

 

[mrzap]

Mollies LOVE THESE!! If you can't seem to rid your tank of them then get mollies.

*Edit due to good advice below: as long as they are compatible with your other fish and your filtration can keep up with the bio-load.

 

[greenmaji]

I would never recommend livestock to fix a problem.. its rarely wise to stock this way, incopatablity and increased bio-load are just a couple of the problems adding more fish/inverts can have.. be it algae or any other aliment the tank may have, proper maintenence is the key to a heathy tank..