Wow, great find bud! Oh you have to talk him into letting you set-up the largest one.
Make sure you express the need for a great sized water column as this will help stabilize your biological system. The larger the tank, the easier to keep pets alive... or something cool like that GL
Soo jealous lol. Sweet find, free is the way to go. If you can't set up one of the larger tanks i'd be more then willing to take it off your hands...lol jk