are you sure thats what they are? How many adults are in the tank? I need some pics of the adults. I may pick up another fighting conch if this is indeed the case.
Edit: do they have a long elephant like nose-snout, and two really long eyes like periscopes. I still would like to see some pics. I don't think you would be calling them snails if they are conchs, they look extremelly differant. It would be cool if thats what they really are. Lemme know I might take some bro.