Join Date: Jul 2010
Location: Outside Philadelphia, PA
Generaly you need to support the entire aquarium frame, especially on larger tanks. You might get away with just supporting the corners on a small tank, like 5 or 10 gallon, but an 85 gal tank is going to weigh about 800 lbs by the time you get water in it.
If the frame is only a little out and not cracked or damaged, you can use thick, wide weather stripping or similar material along the entire bottom of the frame. That will have some give in it and conform to the bottom of the frame and the surface you put the tank on.