Dry Rock Suppliers

[FitoPharmer]

Originally Posted by Reefer Rob

The type of rock makes all the difference. You want a nice light, porous rock. Heavy, dense rock, whether it's live or dry is useless, and will just lead to frustration with your nutrient levels.

That is not 100% true. Rock that is too porous can be also problematic. Dense rock has the anoxic areas that harbor the bacteria that convert no3 into nitrogen gas.