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This grew off of a piece of live rock in my tank and I have no idea what it is. I have had it now for about 4Mo and it has doubled in size.
Can anyone help me out?
I was thinking torch right when I saw it too. Also I was looking at the tenacle below the top right one and thought I saw some of the tips branching a bit from one of the arms which made me think frogspawn. But I think steve, like always, is right.