JVH , I started with a 90 gallon concentration camp for fish . I killed everything and had no idea what I was doing so I bought a 150 to and tied it to my 90 . while I was playing with this I built a 500 gallon plywood that worked good for a few months and the started to leak . I fixed the leaks and taught myself how to work with acrylic and the built my first 4x4x4 cube tank . this tank worked well for a wile and then I moved out of my parents house at the ripe age of 24 and bought my first house . I speced the house not to have windows on one side so i could add a tank later . I moved al my fish into the basement of the new house and started building an addition n the side where I put my 1500 gallon tank . around 06 the girlfriend at the time wanted a bigger house for her not to live in so the genius that I am decided to build her a 12,000 sf house and that was my change to go bigger so I did the 20,000 gallon tank . the tank was not running until 10 or 11 . right now I am in the planning and permit stages of a much larger tank .