I have a betta fish, which I have had for 2 years. A few months ago, my nephew got into its food (which I now keep up high) and dumped it into his tank. I cleaned the tank but not before he ate whatever he could eat. I left him unfed for a few days hoping to let him finish digesting the food that was in his system and recover. That did not work so I tried a dose of Daphnia. Once again the fish continued to lay on its side and he is still behaving like that.
Has his swim bladder been damaged? Is there something I can do for him to help him recover?
He still comes up to eat. He's currently in a 5 gallon tank with silk planks, a cave, a water filter, stone gravel and a heater.