Can any of you excellent people shed any light as to why my Ramshorn snails seem to die off before they get big and old? I have countless small ones in my tank, but they all seem to die before they get above the size of a pea. Water quality should be fine as the cherry shrimp are fine, as are the small snails. The only other occupants are half a dozen neon and ember tetras. Some of my baby snails have gone on to greatness in my father's tank but mine never seem to. Tank is littered with empty shells. I'm in a Thames water area, so water is hard but I cut it 50/50 with rainwater to reduce the TDS.