Gray black lava stone (land and water tank/fish tank landscaping)

Friends who often arrange fish tank landscaping must be familiar with lava stone. It can stabilize water quality and provide trace elements. Lava stone has natural honeycomb pores, which is the best parasitic environment for nitrifying bacteria. Moreover, it has low resistance to water flow and is not suitable for clogging. The surface is rough. Even if the water flow is fast, the nitrifying bacteria living on it will not fall off. In addition, its high hardness means its service life is longer than other filter materials.