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Yes, I don't know why I put Sea Serpent, duh. I found this one website that has the pic of the one we have : http://www.earlham.edu/~eppigch/ophiuroidea.htm
But it doesn't talk about if it is reef safe, I would imagine being that they mainly stay under the rocks they shouldn't hurt anything, but I'm wondering if when we get certain corals if it would hurt it. I know they are mainly night creatures. I'm just curious. Thanks!
They shouldn't bother your corals but they WILL bother your small fish, crabs, shrimp, etc. They are efficient fish hunters. A good sized Green Brittle Star can easily trap a fish in a corner and eat it. They will probably eat sand fauna too which would qualify it (in my book) as not reef safe.