I have a 300 gallon system in the middle of the family room floor, so everything had to be under the tank. WE have a 90g sump, 55g ATO reservoir, Biopellet reactor, GFO Reactor, GAC reactor, all of our electrical, etc... under there. The only thing coming out (when the skins are on) is a single power cable. With proper planning, you can absolutely have EVERYTHING under the stand. of course out stand is also 43" tall
We use 44 gallon Brute trash cans on wheels, for our mixing/water change system. We fill them up and then wheel them to the tank and do our business.