I don't think so. It's nocturnal. They are great scavengers and like to eat so number of stars you add should correspond to size of tank and how much detritus/food it or they will have to feed off of.
It's up to you. If I'm making choice for my tank, I'd do one. You probably have other detritus eaters as well in there, mini brittle stars, your shrimps, hermit crabs etc. you really won't see it much.
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