This month I may get him a 5 gallon. He is still pretty small although he is growing fast and with all my other critters I will ALWAYS be able to use a 5 gallon when he moves to a 10 gallon. That way I can get a good heater and everything for him. Money is super tight this mo th so that may be the best i can do. I imagine he will not want to eat for a while after I move him again, so I am mentally preparing myself.