Thanks. Snails do fine, even pests...Love your tank. You have a great balance in there. I followed your link and read that you have nerites in there. How do they do with the low pH? (I assume since you have ADA AS as a substrate.) Are their shell fairing well in the acid water? I really want to keep snails, brigs, and nerites, but lost one due to acid water melting shell. I have added a little crushed coral and equlibrium.