need some ID help

dogmajones

New member
My brother has a weird red tube on the side of his live rock, most of the time it just looks deflated, but every so often it will suck some water in, and seconds later squirt it back out, can someone help me ID this?
 

Bpb

New member
The more of those things the better. They tend to congregate in low light low flow areas for me. They do some serious work at cleaning water.
 
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