I have had this Betta for 3 months. He is in an Aqueon 2.5 gal aquarium. The other day I decided to put a small heater in his tank.I checked back on him to find the water temp at 76 degrees. I leaned over to look at my Betta and he came flying out of the corner of his tank. He hit the side of his tank and continued going back and forth hitting his tank. I figured he must have seen his reflection in the glass tube of the heater and got spooked. I immediately removed the heater, which seemed to be working properly. From that time, 6 days ago, he has not eaten and doesn't swim around his tank. He comes up for air and that's about it. He stays under his bridge. He just ignores his food. He still has his color, but does swim a little different. Is there anything I can do? Any suggestions will be appreciated. I hate to just watch him die.