24 to 36 pounds is recomended. some tanks will take more some less depending on how you aquascape and what fish you are planning on houseing.
the most recomended amout is 1-1and 1/2 pounds per gallon of rock and sand though.
Mike
Originally Posted by Joshr http:///forum/post/2571519
how much live rock should i get for a 24g
it really depends on what you are going to do with your tank.
FO - none
FOWLR - 24 to 48 lbs
REEF - depends on your bioload. you can use the rule above or you can do a mini patch reef with lots of open space but minimal fish load.