is this even possible. at what size could tanks be sagging and damaging to a house/apartment.
basements are ideal but what if not an option.
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A number of factors could make this possible. How well the house is built, was the tank placed across the floor studs, or the other way (possibly covering only 1-2 studs?, is the tank near a supporting wall, or right in the middle of the room?
Just talking about this makes me think of the time I renovated my parents den. I ripped off the dry wall to find a supporting wall where some of the studs weren't even contacting the ground. Its like they cut them to short and just said "oh well". The house was built in the early 60's as a model home. Its like they fired it together in a hurry without much care, so they could quickly show it off. Even some of the floor studs were higher then others and not evenly spaced. I've worked in renovation/demolition for a few years, and some of the stuff I've seen would make Mike Holmes drop to his knees weeping.
So yes, I could see a bigger tank falling through the floor, under the right circumstances. As far as the size goes, I don't think I'd put anything bigger then a 125g on an upper floor, although I know people do. Even a 125g with water, sand, rocks, the stand itself, your looking at 1500lbs+. A little scary in my opinion.
If your asking this question because your planning on doing it, and are questioning whether the floor can take it, I'd suggest not doing it. Could be one hell of a repair bill.
Big tanks should go in basements imo.