Bristle Star?

[drillsar]

I have see him move from under the rock? Should i be concerned? I read they eat bristle worms thats bad then?

 

[BillyZ]

did you mean a brittle star? For over a year mine never moved, recently, he's started moving again but I don't think there's really any reason to be concerned. They can sit quietly for months, or move around regularly, however the mood strikes them.

I don't think its really good or bad if it ate your bristle worms, but i've never heard that before. Mine usualy just scavenges extra fish food and algae that floats near him.