HI. I dont really have a whole lot of corals in my tank yet, just various 'shrooms, yellow polyps, sponge, etc. Me Puff doesnt pay any attention to any of it. He likes sawing up meat with his fused beak LMAO.
I've been pretty fortunate, I've also had a Hermit crab since last Spring, and some Cerith Snails, and some Turbo Snails, and Puffiz has only gotten ahold of one Cerith. I have seen him hovering over the Hermit and try to peck at it, but not often, and he cant get at it. I guess its hit or miss really. Some Puffers can be unruly, but my best friend also has a Valentini and his is also very good in the tank.
Since I dont have a "reef wall" with tons of various corals, I cant really say either way. LIke I mentioned, I think its hit or miss.