Hello! I'm Ali, and I have a betta named fishie (original, huh?) Anyways, I've had him since I was 9, I'm 13 now and he's 4 so he's kinda old...he lives in a 5 gal. with a filter...my room is always about 78-80 degrees so I felt no need to get a heating fixure...but, recently, his back is...