Estes Crushed Coral Marine Saltwater Aquarium Gravel - 15 Lbs - Case of 2

Estes’ Crushed Coral (15 lb) is a natural calcium carbonate substrate ideal for marine aquariums, African cichlid tanks, or any setup requiring higher pH and alkalinity. Sourced from real aragonite coral skeletons, this substrate has a porous texture and off-white color, and it slowly dissolves over time to buffer aquarium water, helping to maintain a stable pH around 8.0–8.2 and add essential minerals like calcium. Crushed coral is excellent for saltwater fish-only or reef tanks as part of a deep sand bed, and it also serves as a biological filter medium due to its large surface area for beneficial bacteria. In African rift lake cichlid tanks, it creates the hard, alkaline conditions those fish thrive in. Estes’ Crushed Coral is pre-washed and free of impurities – just give it a final rinse before use to remove any dust. It will keep your water chemistry in check naturally while providing a bright, beach-like aesthetic to the aquarium floor.