Brains wouldn't open up in tank with a couple
dwarf angels. Put in 20G reef tank and within a couple days they came full bloom. Here is a before and after. Actually the after they are in sleep mode. When lights come on they will expand another 20%.
So at least for me there are certain corals that won't live peacefully with my dwarf angels. Candy cane, brains and even some zoo's! They are all doing fine in the small tank. The fishes don't seem to bother the mushrooms or the flower pots or the torches and leathers.