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There is no way of knowing that without a positive ID.Is it bad for my corals? Should I take it out?
In the interest of passing on correct information:It does look like a Nudibranch, (sea slug=no exposed gills, Nudibranchs have exposed gills) I also thought cucumber though. More likely the former. I also have no idea on species. If it's a Nudibranch they have highly specialized diets and unfortunately almost all of them are nearly impossible to feed in captivity.