The natural substrate activates the soil flora and is optimal for plant care. The nutrient buffer with a battery effect releases nutrients until it is depleted and can be recharged through fertilization. It is water-neutral and rounded, making it ideal for burrowing fish species such as catfish and loaches. The nutrient buffer has a high iron content and can absorb excess nutrients and release them when needed. The high iron content can be absorbed by plant roots. It activates the soil flora by promoting effective and rapid colonization by beneficial soil bacteria. This helps to curb unwanted algae growth, reduces the load on the filter, and keeps the water crystal clear. The dark brown coloration enhances the vibrant colors of the fish and creates a harmonious overall appearance with the green and red tones of the plants. The substrate is ready to use and should be rinsed once in tap water before use.