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 2 1/2 TO 3 1/2 MM
Application FOR SALTWATER ONLY.
Instructions Substrate is pre-washed, minimum rinse required.