03-06-2003, 07:40 AM
Join Date: Feb 2003
Rule of thumb is 10 lbs. per rated capacity of tank for finished aquarium plus stand and equipment, barring large sumps and refugiums. That gives you, say, 1400 lbs. The tank is about 6 feet long, and spans 4.5 floor joists. The usual distributed rating for a floor is 40 lbs/square foot. You have about a 3000 lb. capability there, and if the load is concentrated next to a load bearing wall, the rating would be more. Doubling joists wouldn't be needed, but it won't hurt anything.