I put together my new system last summer having purchased the new display tank from an old high school classmate via Facebook. He said it was 90 gallons, and I never had any reason to question it. I knew the dimensions, as I built the stand and canopy myself. I've always calculated everything out and listed it as a 90 gallon because I am not familiar with larger tank dimensions. A few days ago I was listening to a podcast and they said a 90 gallon was something different than what I had, so today ...