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Depends on the sponge. I keep happy acros on low nutrients and I have pink, yellow, green, black, and blue sponge growth growing everywhere it's dark enough and I actually have translplanted it to locations where different rocks are touching and it's holding my live rock together like glue. I made a cave structure just so I could see all the sponges lining the rock in one place. The ones that people actually pay for are generally much more difficult.