Kessil

Good or bad brittle star?

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So I occasionally check my tank at night, I generally just see stomatella snails, but this time I found a brittle star! No idea how he got in my tank, and I don't know much about these guys. So as the title states, is he good or bad? Thanks!
 
Got some 'micro' brittles as hitchhikers, and they are supposed to stay small and be a beneficial part of the CUC
 
Beneficial. That's what's typically called a harlequin brittlestar there. They're micro brittles as William mentioned and they don't get very large. I have tens of them in the tank since I feed pretty heavy and they're decent general scavengers. I even have a couple of the large red brittles, on of which stretches an easy 6" across, and they're reef safe (unlike the green ones).
 
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