In three months this tank is moving. So if in three months he is big, he will go back. I have zero problem with him outgrowing the tank, I'm just keeping him for now. In a year, I'll be graduating college and all my tanks will go by the way side. This is by no means a permanent situation. I always find good homes for my fish when I move, but I just like having something temporary. When I bought him she gave me no indication that he would get nearly this size, so yeah, he's just gonna sit there and get big until I move. If I get anything else in that tank that will actually fit, those things will move with me, just like all my other fish have in my other tanks.