Sorry I can't help with the breeding advice. If it's less than a year I would split the tank just for a little while until it gets some size on it. My ball is in a 2 foot by 4 foot cage, but he's just a pet. Your tank probably will get him into adult hood. I know my friend who breeds keeps them in tubs a little larger than a 41qt tub. But I'm not sure on the exact dimensions.