I have a Hawaiian Hawk. Since I've had him, for approx. 6 mnths., He has eaten my camel backs, two hermit crabs, and every single nassarius snail that I have ever bought. He doesn't seem to mind the Blue Damsel. And he leaves the green manderine alone. I would too if I was toxic. He also doesn't seem to bother my Jumbo Tiger Turbo Snail or my big Reg. Turbo Snail. Actually, my Blue has killed four Four Lined Damsels and two other Blues.