What happened to your fish?
I'd go with the 120! the 72 is smaller than it looks. Its only 48" wide which is the size of a 55. Given the chance to decide over, I'd never get a 12" depth tank. Even though the bow part goes out to 18", it really doesn't mean much as most of the tank is 12"D.
I got my 72 because that was what was available in the LPS. It is a very stricking tank, but still smaller than it looks. You also have to work in the price for a canopy which has to be special ordered because it is a bow canopy.
I'd go with the 120! the 72 is smaller than it looks. Its only 48" wide which is the size of a 55. Given the chance to decide over, I'd never get a 12" depth tank. Even though the bow part goes out to 18", it really doesn't mean much as most of the tank is 12"D.
I got my 72 because that was what was available in the LPS. It is a very stricking tank, but still smaller than it looks. You also have to work in the price for a canopy which has to be special ordered because it is a bow canopy.