I've had my Betta for about a year now. It has lived in a 1 gallon bowl with water changes about once a week. This was fine and the temperature was always between 75 and 80 degrees, however, in the winter it got much colder. About a week ago he started becoming quite lethargic and was having trouble balancing. I originally thought it was swim bladder because he was sinking and couldnt stay balanced, however, a fast of three days did not help him. I moved him to a heated/filtered 5 gallon tank 2-3 days ago in hopes that the warmer (78 degree) water would help him recover. However, he is just laying on the bottom of the tank propping himself up on rocks so that he doesnt roll over. He cant make it to the top of the tank to get his food, so I have pre-soaked them in water so they would sink to his level. Although he sometimes sees them, he has trouble reaching them and seems disoriented. I have also tried frozen brine shrimp and a smashed up blanched pea, however, he has not eaten any of it. He has tried and darts around the tank when food is placed in the bowl but cannot seem to eat any and exhausts himself before falling to the bottom of the bowl again.
Any suggestions? This isnt looking good! I tried to take some pictures, however, he's currently in a bad spot and I couldn't get any that showed anything of importance. I'll try again soon.