I have a new axie, about 5cm long. It has been doing fine, except sometimes it seemed to do this weird thing with its mouth when I change the water. Yesterday, when I put it in new water, the poor thing threw up (a lot) and then continued to do the weird thing with its mouth, which I think is like dry heaving. Clearly I am doing something wrong, but I don't know what. It is in a 1.5 gallon plastic tank with treated tap water (treated with aqua-safe). When I change the water, I put him in a little tubber ware container with tank water. I then empty the tank, clean his bridge toy and rocks, refill, add the aqua-safe, and then float his tubber ware on top for an hour or so to make sure the temperature is the same. Yesterday, I fed him while he was in there (perhaps he over ate? but that doesn't seem to be the whole problem). When I let him back in his tank, he started throwing up after a couple minutes. I took out his throw up with a siphon. But by this morning his tank was filthy again (the water is cloudy, and there is something on the surface of the water). Also, this morning there was a strange white substance on a some of the rocks. I need to change his water soon, but I don't want to stress him out again. Help!