I'm about to do a 55 gallon Amazon tank, and I was wondering what you all think about the safety of having it on an upper floor. My house is one of those 1960s split level jobs. It's pretty solid, and the place I've chosen would be right above a steel support beam. I remember reading that tanks up to 55 gallons were generally safe for upper floors, but I'm a very cautious type. Any opinions? Experiences?