although i've never kept a large brittle star i do not believe they will harm corals or at least i've never heard of them doing so, i have however heard of cases where they will eat fish given the chance to grab them
how big is it though? micro brittle stars are a common hitchhiker and stay small 1" to 2" is it possible thats what it is if you got it with your coral? if so they are beneficial cleaners, i must have a hundred in my tank
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