i wouldnt recommend using turf as i stated top soil is your best you want to get a tops soil that hasnt been treated with any chemicals i find levingtons tops soil a good choice.One important factor to recognize is that different types of substrate retain different levels of moisture. Clay type soils and forest type substrates hold far more moisture than do sandy, desert substrates for example. Many species need to be able to burrow or to excavate shallow ‘scrapes’, and the substrate used within their habitat should allow this. These burrows /scrapes are vital microclimates and where tortoises are deprived of these facilities a whole train of important self-regulatory functions is disrupted. Grassy lawn type substrate altho may be beneficial for sulcata or leopard torts it can cause problems.Thermoregulation and temperature stability are also greatly affected by the substrate that tortoises’ experience.
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