A few years ago Larry brought me three nudi branches, he acclimated them and placed them on a 30 lb piece of live rock that was too valuable to destroy to get rid of an aptaisa problem. After a few minutes you could see the nudis eating starting with the roots first and working there way up. After a few weeks the visiable aptaisa where gone so I guessed they where eating the ones you don't see? In this 158 gallon tank I lost them after a while, but I never had a problem after that. I had a Copper Band in the tank but he did not attack them that I know of? I do believe you can not have peppermint shrimp though? One thing about Copperbands and peppermints is that they are mowers on aptaisa, they don't kill them, just control.