AquaGlow Red Lava Rock Substrate (5 lb)

Crushed red volcanic lava rock fragments (5–15mm) that double as substrate and biological filtration media. The highly porous surface area harbors massive colonies of beneficial nitrifying bacteria, making this an excellent choice for cichlid tanks, Rift Lake biotopes, and high-bioload setups. Naturally raises KH slightly — ideal for alkaline-preferring species. Rinse thoroughly before use.