Substrate

Substrate is the material used to line the floor of an enclosure, and the right choice depends heavily on the species being kept rather than any single option working everywhere. Options range from simple paper towel or reptile carpet, to coconut fiber and cypress mulch that hold humidity well, to sand-based mixes for desert species, to full bioactive soil blends built to support live plants and a cleanup crew.

Depth and texture matter as much as the material itself, since burrowing species need enough loose substrate to dig into, while species prone to impaction from accidentally swallowing loose particles while feeding often do better with a firmer, less particulate substrate or careful feeding practices that reduce the risk. Humidity-retentive substrates like coconut fiber need occasional misting to stay at the right moisture level, while drier substrates need almost none.

A common mistake is choosing a substrate based on appearance rather than the species' actual needs, such as using loose sand for a species prone to impaction, or a dry substrate for a species that needs consistently high humidity to shed properly. Substrate also needs regular spot cleaning regardless of type, since waste left in place can raise ammonia levels and encourage mold, particularly in humid setups.