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Thanks! From this link it looks like a Dorvilleid Polychaete -- basically a eunicid. A link there says that Dorvilleid polychaetes are related to the big eunicid worms (which is what I thought of when I first saw them -- had a 28" long one in my tank a few years back). But they only have the four antennae -- not five. They also have jaws, but the text was inconclusive on whether they used them on livestock or just algae. Sigh. The ones we have are free-swimmers rather than crawlers. Reckon I will just keep my eye on them. Unlike the coral killer I once had in my tank, these guys supposedly stay small. Thanks again!