So I went to work this morning and my tigrinus cat was doing fine when i got home he was laying on his side every so often he would try to swim go near the top of the tank go belly up and sink to the bottom and lay on his side. I got him out of the tank into a bucket gave him a bubble stone 50% tank water 50% fresh water. His tank sits at 80 I rose the water up to about 84. Any help you can give me would be greatly appreciated.