This clean-up crew pack includes various sizes and species of isopods and springtails for large 60+ gallon bioactive enclosures. Includes 50+ Dwarf White isopods, 50+ P. pruinosus Powder Blue isopods, and two 8 oz. cultures of a mixture of species of tropical/humid springtails, which are on substrate. Other isopods/springtails that do well in humid/tropical bioactive enclosures include Venezillo parvus, Venezillo parvus Dalmatian, any P. pruinosus, Cubaris murina Little Sea, Party Mix, or Papaya, Folsomia candida springtails, Pseudosinella violenta Bylas Ant, Seira dowlingi Silver, Coecobrya communis Pink/Tropical, Proistoma Minuta, and P. laevis Gray/Dairy Cow/Milkback/Orange/White. Please see shipping details for shipping cost information and live arrival guarantee. Isopods will be shipped in a container of organic peat moss, sphagnum moss, and organic leaf litter. Springtails are shipped in a container of topsoil and peat moss. Both containers can be simply dumped on top of the enclosure's substrate. There is no need to "bury" them in the substrate. A thick layer of leaf litter at all times is the key to a thriving isopod colony.