Now that I have my tank (75 gallons), I've been giving some thought to weight. The spot that I'd like to set it up is in my dining room. I'm a little worried that the sheer weight of it will be a tremendous strain on my flooring and the thing will crash into my basement. This may be silly of me, I know. A brief stab at it with the calculator gives me something like 624.75 lbs. just filled with water, no factoring in of rock, sand or stand/lights. I could set it up in the basement--but thats going to get pretty cold pretty quick and its out of the way. My floors are hardwood, the house was built in the 40's. Any one else have this potential fear? I tried searching the forums for "tank weight" and several variations but couldnt find anything.