A group of tropical springtails in an old substrate - a box of 200-250 ml. The number of individuals is sufficient to establish a large colony in a terrarium. After knocking part of the group into a heated terrarium with a moist substrate with enough organic material, it will multiply within a month to the number of several hundred to thousands of individuals.
Tropical springtails are an indispensable part of the substrate and help break down organic residues accumulating in the terrarium. They like fungi, rotting food, and a stable colony can excellently reduce the formation of unwanted pathogens in the substrate, which attract other unwanted organisms, such as mites.