I decided to save my betta from dying in an abandoned bowl. The previous owner kept him in a 1 gallon bowl that was never cleaned and at 68°.
I'm trying to rescue him. So now he's in a 5 gallon tank at 78° and much cleaner. However he is still sick and I'm not 100% sure what is wrong. He has more energy now and I'm guessing because of the warmer temperature, clearer tank, and more room but he's still stressed. I'm guessing his age may be related to his lower energy level too. I have no idea how old he is but his fins are needing some treatment.
His dorsal fin looks clamped and the tip is rotted away. Like ashy color. Looks like a piece of cooled ember. I'm sure there's probably multiple things wrong and I need know what I should do?