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I went to a local fish dealer and he says it's either a form of sponge, or it's a worm that creates a calcium tube trail.

I've got the same thing happening. THE STUFF IS EVERYWHERE!!!! I even found some of it in the biowheel filter. I bought my tank over the weekend and when I rearranged the live rocks, I saw it all over the bottoms of them. I asked the last owner of the tank, he said it's a form of fanworm. He...