I have one in my tank too. I think it resembles more of a slug than a worm. I have actually seen it releasing what appears to be eggs. It seems to do a great job keeping the rock clean but knocks over frags. I saw it stretched across my tank once from one rock to another and I swear that sucker was 8 inches long ... and I didn't see the end of it.
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65 g mixed fish with various lps, 50 lbs live rock, remora skimmer, 2 A150W sky blue Kessils
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