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Good FS Sponge, and good Set upI lurked for a while, and I support SHNICI's post. I have no clue what and SP vs. FS sponge refers to though. My blue photosynthetic sponge was a purchased product that grows differently, so it's far less invasive. Grew right through some zoanthids and choked them out, but since it makes shelves it's easy to confine to a rock. It looks the same in coloration as yours though, and the texture sounds similar. Pic below.
If the owner of this tank isn't concerned about it choking corals (FOWLR for example) then it's really not a problem at all. It's fairly attractive. If they have corals though, it's best to keep this from getting out of control. Follow the post above.
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