Hey guys I need help. I am getting frustrated hardcore. I cant keep a snail for more than a week to save my life in my ne 40gal FOWLR. I have had a lawnmower blenny, cleaner shrimp, porcelain crab and 10 hermit crabs in there for a few weeks but i cant seem to keep a snail for more than 3 days. My water parameters are good. Ammonia 0, Nitrite 0, Nitrate 5, Ph 8.2, calcium 420 and I add Purple up every other day... Any thoughts?