01-29-2013, 12:28 PM
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Freshwater weighs about 8.33 lbs per gallon, saltwater closer to 8.5 lbs per gallon. Then you need to account for weight of stand, aquarium, substrate, rocks, etc.
A standard 55 gallon glass aquarium will weigh about 625 lbs filled. Now if you have a sand substrate a few inches deep add another 126 pounds (wet sand). Once you add a stand, pumps, rocks, lights, canopy, a 55 gallon tank can weigh anywhere from 800 lbs - 1,000 lbs (½ ton).
I would be careful on tank placement in a pier and beam house. You might cause the floor to bow, which in itself could cause a host of issues. I do know people who have large tanks in a pier and beam house without a problem to date. IMHO, it depends on the house as some are built much better than others.
We are currently renting an older home and I will only keep our 55 gallon in room which was an addition with a concrete foundation. This is because the floor doesn't feel solid enough for me to take the risk.
I know much of this was a non answer, lol, just thought I would put it out there.