so i bought an enemrald grab yesterday( big red one) and hes pinching at my clown fish. this is making me very mad scnce i bought the nicest clown fish i could find. he also pinches at my cardinal. r they supose to be like that. can he possibly kill any of my fish. if he can or does, im taking him out. (emerald crab beat down) literaly. i dont want my beautiful clown fish to die, or my beutiful cardinal.