Several years ago I had a pair of rabbitfish... a gold spot and a two bar. Both were pretty small when I got them and put them in a 180 gal. I was AMAZED at the growth rate of both of these fish. They eat absolutely everything you throw at them and they must have superb conversion efficiency. Less than a year later, they were each about 10" long and would certainly have grown bigger. I rehomed them to someone with a larger tank. I did have issues with at least one of them eating the tentacles off a couple duncan colonies. Very strange. They may have picked at other corals too.
Have also had a few foxface. None of them ever picked at corals but they are shy for quite a while. My current one-spot has been with me for 9 years and is quite hefty. Regular nori feeding seemed to make him less shy and he comes around whenever I'm by the tank. The foxface grow considerably slower than the rabbits and do not get as big. For long-term success I'd always opt for the foxface personally. Mine have also done the "air chewing" which is kind of funny to watch.
Have also had a few foxface. None of them ever picked at corals but they are shy for quite a while. My current one-spot has been with me for 9 years and is quite hefty. Regular nori feeding seemed to make him less shy and he comes around whenever I'm by the tank. The foxface grow considerably slower than the rabbits and do not get as big. For long-term success I'd always opt for the foxface personally. Mine have also done the "air chewing" which is kind of funny to watch.