It looks like maybe a 55 gallon. I didn't see where it was actually noted. Assuming it is around 55g, $100.00 is a great deal for tank, stand and top. But, depending on the condition of your phone. It could be worth much more than $100.00. If you have a Best Buy type store near, you might want see how much in store credit your phone is worth. Unless cash is a problem, than its a good deal.