10 LitreProRep Tortoise Life is part of the species-specific life series of substrates and has been created to meet the needs of tortoises originating from arid habitats, particularly Mediterranean and Russian tortoises. It is a blend of ingredients that provides the ideal mix of texture and moisture retention to simulate the soils found in their natural habitats. The addition of pure limestone to the mix provides additional calcium if the substrate is eaten. It is also suitable for many species of lizards that originate from arid habitats.