It's a Siganus Virgatus, the only rabbit I have found that will touch the stuff....I put rock in the tank with him and he cleans it off. When/if it grows back I put it in again for him to clean off...my other 2 that I have had don't touch it, however both of these that I own will mow it down....but they do get big...not too quickly though.
Here's an image..it's not mine...but the same...also called a Double Bar Rabbitfish
