Weight is tough though because some rock is very pourous and some is very dense. In my 75gal I only have about 90 lbs of rock but it seems like a ton of rock because I chose very "light" rock. If you choose a type of rock that is very dense you may need a considerable amount more. 1-2 lbs per gallon is what people suggest, and its a good rule of thumb. But it may vary greatly depending on what rock you choose.
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