Originally Posted by onefish2fish
ive heard the prism skimmers arnt up to par and your better off saving your money.
OF2F has probably heard this from me, as well as others. The Prism is a piece of junk. First hand experience. The SeaClone is far better for a cheaper price, and it leaves a lot to be desired.
I do think 70 pounds of rock is probably excessive. You will generally need anywhere from 1 to 2 pounds per gallon, depending on the density of the rock. Some rock is more porous, and of larger size for its weight.