Nature's Ocean marine gravels are made from natural aragonite with out added chemicals or dyes to disrupt your water quality. Naturally buffers to a pH of 7.8 - 8.2. Great for your saltwater, reef or brackish tank. Not suited for freshwater tanks.
Specifications Package Size 20 LB.
Grain Size 0.5 TO 1.5 MM
Application FOR SALTWATER ONLY.
Instructions Substrate is pre-washed, minimum rinse required.