This is a light and fine substrate with black pebbles perfect hold for plant roots and a substrate for freshwater aquarium and aqua-terrariums. Digging fish, such as rays, kuhli loarch and catfish absolutely need a substrate which is not sharp-edged. This coarse-grained and round0shaped natural sand is gentle on their sensitive barbels. It is also an ideal substrate for the aquarium have invertebrate animals. It is great if use together with JBL AquaBasis for the planted tank.