Interesting Find

SonicGT02

Reefing newb
Tonight I shut down all my pumps for the tank, so I could treat the aiptacia. When I plugged back in the pumps in the sump, neither of them would work!! What are the chances that they both quit at the same time. Long story short, I found these creatures in the back part of one of the pumps. I've never had any bristle stars or anything like them in my tank, that I know of. They appeared to be green with a brown center. I hope they are not bad, as 2 of them actually moved, so I put them back in the tank. Can anyone tell me what they are?
 

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I have these and they are a great part of the CUC. I have them in my biocube and they don't bother anything, I have the cleanest sand though! Plus I think they are super cute.
 
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