RMD how big are your Fighting conches. I just got two and they are full grown(about 3-4 inches). If I had known they were going to be grown I would have only gotten 1. They do a great job on the sand, and I have seen one on the rock. they are too big to climb the class. It os funny looking when they try, it looks like they are going to come out of their shell. I have noticed one of mine going up to the other and it looks like they may be mating. the one extends something into the shell of the other. I don't know if they are fighting or mating.