Black Volcanic Lava Rock 15KG An anaerobic environment is created inside the rock as beneficial nitrifying bacteria consume all the oxygen in the water. Within this anaerobic environment inside the rock, denitrifying bacteria consume the nitrate and produce oxygen and nitrogen. We all know how nitrate in the aquarium is bad news for fish and shrimp so Lava rock really is the most natural and best way of removing nitrate. Benefits: Ideal for ferns and moss growth Denitrify the water Doesn’t create any pollution or radiation Best for aquascaping
