SubstrateSource Black Lava Natural Gravel - Sample
- Sample - approximately 1 tablespoon
- Plants love it - highly porous
- Screened, washed and kiln dried
- No wet weight - shipped dry!
- Uniform size and texture (10-20 mm granules)
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Nutrients: The lava has not been treated with additives or altered from its naturally inert state; however, it does have a high Cation Exchange Capacity (CEC). CEC is a measure of a substrate's ability to store and release compounds including critical nutrients for healthy plant growth. These nutrients are absorbed from fish waste or fertilizers added to the aquarium and made available in the substrate bed, at the root site.