My first tank was a 40 gallon, and only had soft corals, and my valentini puffer never touched any of them. I upgraded to a 220 and that same puffer was moved over to the new tank, which had an even larger assortment of soft corals and many other types and he never touched anything. Unfortunately he got spooked one night and jumped before I had my lids constructed. He died and was later replaced and even he successor has never touched a coral.