I have 2 tanks. Set up right now. My 14 gallon has a play and 3 Cory cats. My 50 gallon has 2 tiger oscars, a jack dempsey, and a convict. I understand that it is crowded. The JD and the convict do not leave their caves except to eat. The JD is about 5 inches long. Since he doesn't swim around in the tank do you think it would be fine to move him into the 14 gallon tank and move the fish from the 14 gallon to a 10 gallon. Maybe if he was by himself he would come out more. I hope to get a bigger aquarium for the oscars this summer.