Springtails (Folsomia candida)Â are tiny arthropods (1-4 mm) and are used as "Tank Janitors" in a terrarium, eating mold and waste. They also make a great supplemental food for your poison dart frogs. When you add springtails to your tanks they will reproduce. Simply dump the entire springtail culture in your terrarium and mix the charcoal in the springtail culture right into your substrate. One culture can benefit 2-4 terrariums. Cultures are started 1-2 weeks before shipping. Feed weekly with Josh's Frogs Spring to Life Springtail Food If you are not adding to terrariums, we recommend that you buy a starter culture and use it start a larger culture (we use 5 qt. Sterilite containers). Larger cultures produce better and are less prone to CO2 buildup. If you use this smaller culture to start a larger culture to feed froglets or seed multiple tanks, allow the culture to grow for a month before use.