[ACBlinky]

I have the same type of whelk in my tank - never knew what they were called before! Mine has grown from about 1" to 2.5" long in about a year, and eats EVERYTHING. I typically offer it food every few days, and the rest of the time it scavenges. It's amazing just how much food these guys can put away in a single sitting - I once watched it devour 3/4 of a large silverside in about two minutes, it was astounding! These snails are harmless IME, and invaluable members of the CUC - not only do they stir as much sand as 20 nassarius snails, they're great insurance to have around in case a snail, fish or crab happens to die unnoticed.