I bought springtails 2 years ago, and it's been going since then. As long as you don't let the viv dry out, and keep food in there they just keep on going. I always have a
piece of bug burger in there to feed the springtails, pill bugs and any stray feeders that might have made a run for it. Jumbo 32 oz Temperate Springtail (Colombella) Culture - Springtails | Josh's Frogs