First, relax. You've got a very durable fish. try to increase the water temp to the high 80's and add 1tbsp of salt for 5 gals. of water. Salt and increased heat help alot in these situations. If his behavior has not changed too much. dont panic. PLEASE, learn how to check your water parameters. Your local fish store will help you. You NEED to know nitrites, nitrates, ph, temp, and ammonia. They are the basics. But you must at least teach yourself how to do that. VERY EASY !