What size aquarium can you safely put on the second floor of a house. im looking to upgrade and want to put a 24x 24x 48x (120gallon) with a 50 gal sump on the second floor of my house. I currently have a 50 gal 20 gal sump where I want to put the new tank and have never had an issue. I understand it depends on framing of the house but I can't exactly tear up my wood floors to check out the framing. I'm hoping a tank that size won't be too big for the 2nd floor, what's your thoughts?