haha. mine has been doing an excellent job of keeping the rocks clean. sometimes I put flakes or mysis/brine in there, he will eat algae off the rocks AND the other stuff simultaneously. he is such a pig
but he is really good about avoiding the corals, he never touches them.
now that I think about it, the other day, I spot fed my candy cane, and a pc of brine was hanging out and he just looked at the pc, thought about it, and still didnt bother the coral. I thought for sure he was gonna grab it