Peat for the spiders. The best soil in terrariums, perfect moisture and mold resistant, more than any other primer. Sold in liters.
Thermo Heating Cable waterproof heating cable for terraria with double silicone sheath. Deal terrarium bed heat, e.g. for reptiles and amphibians usable as daytime heating for ground living and nocturnal heating for tree living species with 150 cm non-heatable cable including suction cups.