What the substrate needs to do
Use a clean soil-style substrate for Lasiodora klugi that can hold its shape without becoming hard, dusty or permanently waterlogged.
For Lasiodora klugi, the substrate in a Bahia Scarlet enclosure should support normal movement and retreat building. Heavy decor must not be able to collapse if the spider digs underneath it.
Depth
Bahia Scarlets are terrestrial, so give Lasiodora klugi enough substrate for normal digging while also keeping the fall distance from the lid low. A stable ground-level hide should sit securely on or in the substrate.
Match substrate depth to the current size of Lasiodora klugi. Small slings and fossorial individuals often use proportionally more depth than a large settled terrestrial adult.
Moisture
For Bahia Scarlets, keep a water dish available and maintain moderate lower-substrate moisture; provide strong ventilation. Add water in a controlled area and judge how the enclosure changes over several days instead of trying to keep every centimetre equally wet.
Substrate moisture for Lasiodora klugi should work together with ventilation. Persistent condensation, a stale smell or widespread mould usually means the setup is staying too wet.
Compaction and stability
Press the lower substrate layers firmly enough that a retreat or burrow for Lasiodora klugi does not collapse immediately. The upper surface can remain looser where appropriate.
For Lasiodora klugi, keep rocks, heavy cork and ornaments in a Bahia Scarlet enclosure low and secure so excavation cannot undermine them.
When substrate needs replacing
Spot-clean waste and prey remains from the Lasiodora klugi enclosure. Normal digging, webbing or rearrangement by the spider is not a reason to replace clean substrate.
For Lasiodora klugi, replace all substrate for a Bahia Scarlet only when it is fouled, contaminated, persistently mouldy or no longer structurally usable.