I know Plate Corals can get large. Mine is in an optimal spot for pellets to land on it and it wolfs them down daily. My hermits will trample any and all corals in my tank to get to food, they will not walk on the Plate Coral however. Can a Plate Coral eat a hermit? I've seen pictures of a mini carpet anomenemeneneenen eat a snail recently on nano-reef so I know hardshell things aren't always safe from our corals.