A natural substrate made of crumbled coconut fibre and free from any chemical additives, which guarantees safety of use in terraria with even most delicate animals. BIOTERRA has a shape of a compressed brick of natural coconut fibre. It should be soaked in 3-4 litres of water. Its volume will expand to 8-9 litres making a delicate and moist substrate to be used in terraria with amphibians and reptiles from tropical rain forests as well as in insectaria. It can be used independently and as a supplementation of other terrarium substrates. BIOTERRA is also a potting medium for tropical plant culture.