i have a green brittle star in my reef tank ive had him for years he has gotten quite large body size of a golf ball my question is what could he do as far as capturing or eating smaller inverts (crabs,snails ect) anyone have any experince with this? reason i ask is seem to lose crabs quite often,just put in 2 porcelin crabs less than a week ago and both seem to have vanished i did find one claw from one of them but no other signs