Age I think. You never know how old they are when you get them in. Buy from a reliable source maybe? They only live for about 2 years I think.
Seachem Flourish killed my Nerite snail, I think it was the copper sulfate in it. If you are putting anything in the tank with the name of a metal in the ingredients I would say thats whats killing them.Why I am loosing my Nerites
I loosing 3 to 4 snails a month I bought them from different sources
And the turn up dead ??
My water is fine I run tests every week the only thing I have in the tank are two angel fish and 20 neon tetras and some cherry shrimp some are just dead and there are times where I have an empty shell
Thank you for your help