we're actually looking to keep with the 72 but we're going to go a bit wider 30" and not as tall 20". The current tank is scratched in many places from falling rock and has two chips in the brace, so we're looking at a new tank and stand. Hopefully with the wider tank we can avoid stacking the rock so tall and it will give us more room for cleaning. Also I would like to get rid of the internal overflow design. It looks neat but in reality in consumes too much of the tank. Anything behind the overflow is lost for veiwing. If I could see both sides of the tank I would go with this design again but because we're up against a wall I like the external overflow design.