A light and fine substrate containing black gravel for freshwater and marine aquariums.

Main Features:
• Substrate with a grain size of 0.8 mm for freshwater and marine aquariums and zoos.
• Prevents mucous membrane injuries: the natural sand with a coarse and round shape is gentle on sensitive fins. Ideal for digging fish such as rays, cichlids, catfish, and others.
• Ideal for fish, invertebrates, and plants: no unwanted pollutants are released into the water.
• Usage: The substrate is distributed over the nutrient substrate (about 6-8 cm for strong plant growth). Very suitable for heating cables under the gravel.