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Originally Posted by LTO
A 4'x2'x2' tank holds around 430 litre which is 430kg. Sand and stone does not add on to the weight cause they will displace the water. U add the weight of the tank and X 2 for 2 tier than it's around 900kg.
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Agree on the above, but here's a correction & another point to note:
-> Sand & stone will displace water, but they are (usually) of a higher density so they will add to the total weight of the setup.
-> Glass used for the tank is another consideration. 4'x2'x2' of 6mm glass should be around 100 lb (approx 45kg), give or take 20 lb (9kg).