What is this!?
 

Is it a bristleworm? Good or bad? It is inside one of my rocks right now.
It is beside the grape caulerpa in the centre. Its pinkish orange.
http://i9.photobucket.com/albums/a69...001MYSTERY.jpg


Thanks.


js

Yep, bristleworm. Is good, ya ya. Well, mostly. When you lift a rock up and there's one of these under your thumb you might curse them a little.

There are a few exceptions where bristleworms are a problem (i.e., seahorse tanks), but for the most part they are harmless detritivores that clean up in your tank.