OK, we are talking the little pyramid snails, I'm asking about bigger snails. I caught two snails attached to the bottom of my baby maxima. I just got the maxima and a crocea, but I've had a small derasa for a while. I've never seen them bother the derasa, but tonight I came home and saw that both snails had attached themselves to the bottom of the maxima. The snails are maybe a half inch in length. Cone shaped shell, dark colored. Almost a dark gray shell. I have some pics and I'll post them if necessary, but I was wondering if there are any known snails like this that prey on clams. They also have a syphon coming out, kinda like a nacarius snail(sand dwellers perhaps). Thanks in advance.