I have a beta fish in a 10 gal. Heated (78°) tank. I tested my water and it's perfect I also do regular water changes once a week. My problem is that all my beta dose is sleep and I don't know if there is something wrong with him.i have another beta in the a diffrent 10 gal. And he's fine. The sleepy beta dose eat but other then that he stays at the bottom of the tank.please help!!!