I had a couple of these in my tank. They came in on a rock that a coral was attached to. I knew they were bad but I was busy with work and kept putting it off. These things nearly took over my entire tank in a couple of months.
I went to the store and got a couple peppermint shrimp and put them in. After a few weeks I didn't notice much of a difference. There were a lot of anemones so maybe they were eating them and I just couldn't tell.
I went and got a CBB though and within approximately two weeks they were all gone. The big ones, the little ones.. all gone.
I was amazed at the rate this fish ate up these things. I'm sure the shrimp helps on the feast too.
Now, he's one of my favorite fish (his name is stephen hawking). He's beautiful. He gets along with all my other fish as well though occasionally the FoxfaceRabbitfish will puff up around him. They've never fought though.
But yeah, the CBB worked great; however, they do need a pretty large tank.