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Oh ok, a few people on another page have suggested detritus worms of some kindbristle worm
Thank youNot a bristle worm, some kind of ciliate. I don't think we know enough about the ones present in the ocean or our tanks to classify them as good or bad, but they're small enough that their food is single celled organisms, so it's unlikely to be able to hurt bigger things. Detritivore is likely, though its food may actually be things living in the detritus.