Hi! I currently have a mystery snail by himself in a 5 gallon lightly planted tank with a filter and heater. Over the past couple days heís been doing a bunch of weird things. 3 days back he was floating at the top of the tank, but went back to acting like normal later on. Than the next day he was floating once again. Today I came home and he is half out of his shell with slime. I picked him up and he retracted only a little back into his shell. No smell. I have been doing half water changed for the past couple of days. Is this some more goofy mystery behavior? How can I help my little buddy out?