My Betta, who has been resting at the bottom of the tank for a week, has now stopped eating. He has been very active and healthy fish for 7 months and now I can't figure out what is wrong. His fins still look good and he was still eating, but today he has stopped eating. This is the very first time that he has not eaten his food. I think he is going to die. Maybe I need to give him some kind of medicine. I have had two other Bettas that lasted for more than two years without any trouble. My local fish store is of no help 
