My son has had a red eared slider for going on 17 years. About 3 months ago it quit eating, and now it has developed a sneeze. It sneezes at least 10-15 times a day. He stays up on his floating log most of the time. There are feeder fish in the tank, about 10. He use to kill and eat them quickly when we first put them in. Is there something we can do? I think he is tired of living in the tank and would like to donate him to a zoo or aquarium. My son is now in college.