The emerald floated to the back of the tank turned himself upside down and started having spasms. We flipped him back over, and he clung to a rock, then a few minutes later walked back towards the back of the tank and didn't move. The next morning he was still in the exact same position, so I knew he was dead. In fact we watched him die last night.
Also this morning the two hermits were also dead, their shells empty. We did find one body on the complete opposite side of the tank. Did not find the other body.
Snails, star, and shrimp seem fine. Water temp is 82, is that too high? Retested water this morning, all is exactly the same except ph is now 8.0 instead of 8.2
Also the emerald was white, not green, but was like that in the shop, as was his tankmate.