I bought 2 emerald crabs and they havent done anything algae wise, they munch on my acros now and then. I caught one and he now lives in my sump and his buddy will be joining him as soon as I spot him again.
I dont know if all these guys will eat it or if its just mine that does, but my new convict tang eats the smaller ones and pulls the bigger ones off the rocks, so atleast its floating and I can snag it.
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