You start out with one 20 gallon tank and 23 years later after you have owned over 10+ tanks and then finally settle down to just 4 tanks with the biggest being 520 gallons.
Also when you have a hard time fitting the tank and stand though the dorway. If the dore was any less wide my 120 48x24x24 it was about 2-3 inches less open it would not have fit