Maybe this is normal. Everybody else is doing great though. I think because I'm not gettin a lot of algae they're not getting enough to eat. But of course they could actually be hiding from me in the gravel. That might be what's goin on because I sometimes see several popping out of the gravel while several more just have the very end of their tips of their shells hangin out. I really love these guys though. They are excellent for planted aquariums. They actually don't eat plants unless they are decaying.