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Does anything eat them. Not pineapple, they are not a problem. I have this other sponge that looks like roots from a tree. It was ok in the sump, but now I have it in my DT. Supposedly exposing them to air kill them, but it's a bit hard taking out big chunks of live rock
Not really. Most things that eat sponge are specialized sponge eaters. You are looking at Rock Beauty's and Nudibranches. Please don't get a rock beauty for this though.