hi all having just bought a new 200 litre /40 gal tank i was wondering if it was possible to place this upstairs in my bedroom it would be running across the joists but the weight is going to be in excess of 300-350 kilograms.any help please.
Water weighs 8.8 lbs per gallon. 40 gallons would be 352 lbs (not KG). A 40 gallon tank will probably have less than 40 gallons of water, but with rocks and filters and substrate and all a little extra weight is added in. You'll probably be closer to the 400-425 lb range. While heavy it is not an unreasonable load for your home to support if it is in decent shape. I think that it would weigh about as much as my ex-wife and she never fell through into the living room.
I wouldn't worry about a 40 gallon tank too much, a 400 gallon tank could be a problem though.
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