My betta was being kept in a ten gallon tank with a filter and a heater. I keep my room pretty cold, like 65F. The heater broke and I didn't realize anything was wrong until he got lethargic. So, I rewarmed his water to about 78F, but he didn't show any improvement. He started sitting on the bottom and I can't get him to eat anything. Not a green pea, not fish flakes, bloodworms, or even flightless fruit flies...Then he developed tiny dark spots in a linear pattern all across his fins, but only his fins. Now he has gotten really pale. I ended up putting him in a bowl because he was getting too weak to come to the surface. Now his gills have gotten really dark in color, like blotchy. He is still coming to the surface and getting air, blowing bubbles, and looking around and responding when I talk to him. Does anyone know what is wrong with him and if there is anything I can do for him? I've probably done everything wrong, but I really don't know. Help, please.