I had a couple of apple snails in my tank a few months ago. They seemed to be doing really well and were pretty active wtih the lights on. I lost them when I had to move them to a spare tank when I had to treat ich. The heater in the smaller 10 gal went waco and the snails were dead one morning. My main tank (90 gal.) has since been cured of ich. I used a copper type product but have done many PWC and added charcoal to my filter to remove any remaining meds. My replacement snails don't last more than two days. My fish are thriving and healthy (angels, clown loaches, one pleco, two gouramis, platies). Any ideas? Water params are Ph 7.5 GH 10 Ammonia-0. I RO water with tap to keep my nitrates down.