I just got a 36 gallon Aqueon bow front aquarium yesterday. This morning I heard creaking, popping noises every few minutes. The tank is off level by 1/8th of an inch both back to front, and left to right. I am draining the tank right now, as it only has plants at the moment. Is the tank too heavy for the old wood floor? I am in a second floor apartment built in the 20s. Is it just the floor settling to the new weight? Or, was the tank or stand going to break because it was not quite level? This is only my second tank ever, and after my 15 gallon column tank this is a lot bigger.