How big are they now?
From what I have read only the green brittle stars will actually hunt fish and can get to 20 inches. If they haven't caused any damage to this point you might be fine.
Most are opportunistic feeders so if you had a slow sick fish for example, consider it lunch. Other than that they are very good scavengers and should be ok.
I have 3 or 4 baby black and white brittle stars living in a veggie clip of all places. I hand feed them once and awhile just to keep them happy. Why they are in that clip is beyond me. Started with one and now there is at least three.
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I bent My Wookie
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