I have springtails naturally all over everything I do here. Not a large species but they are everywhere. Once I set something up with animals they all but vanish or their numbers go to minimal at best. I just thought a container of charcoal with the right amount of water in it giving a prime habitat might keep number higher than they otherwise would be. A small screen over the culture keeps the frogs form making quick snacks of a majority of them.

Is kinda like my woodlice I put in the enclosure. A lot were eaten, some buried themselves and a few drowned. Now if I had a piece of rotting wood in there they would likely have made homes in under and around it and might even have eventually reproduced. With springtails being so prolific in charcoal I just figured a small culture in the enclosed of their prime habitat might keep numbers higher and help them clean things better. Give them their preferred medium, the one they have been cultured in for who knows how many years and it may produce more than a standard enclosure could ever produce without having to seed the tank all the time.

I do agree that a separate culture or 5 is a good idea as backups.