The Planted Tank Forum - View Single Post - What's that bug? How to recognize them
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Old 11-28-2007, 06:04 PM   #42
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Here is another little nasty that is found sometimes in a planted tank.

Freshwater Bristle-worm:

They typically live deep in the substrate, or in the filter. The largest I have seen was nearly 4 inches long, it was munching on some mulm about 2 inches deep in the aquasoil, up against the glass. The smaller ones just look like red worm, and you have to look very close to see the bristles.
I believe they are harmless, since they seem to be a detrivore. However, I have not touched one to see if they sting like some marine varieties. There have certainly been no dead fish with a row of stings up their side.
IMO, this is the nastiest of the nasties you can find while working on your tank.
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