I'm in the process of building a reef aquarium. It will have a movable sump which will slide out from under the tank. I would like to know if this will exceed the tipping force and cause the tank to fall over. Components: tank=100lbs 24"x24"x20" 45g salt water=385lbs stand=approx. 45lbs 24"x24"x37" tank and stand dimensions=24"x24"x57" sump dimensions=20"x15"x16" The sump when filled to the brim holds 20g @ 172lbs and sits 7" above the floor inside the cabinet. It extends two thirds of it's length from the cabinet. Below is a picture of the assembly. I'd like to know if the sump when filled will cause the tank to tip when extracted from the cabinet below. The sump will never be filled to capacity, but this would be the most extreme scenario and I should account for it. Any and all help is greatly appreciated. Note: the sump sits atop a sliding TV base rated for 225#. The tank will also contain sand and rock structure, but were not included as the bare tank with water would be the minimum load for the calculation.