Like the other 2 guys said, just add them to a tank and they should produce. Leaf litter really helps them establish and hide from frogs as well. I was told of another method of using a small bin that would be sunken into the substrate that would be full of food for springtails (leaves, rotting vegatation, etc) where they would be heavily produced. It seems like a good idea, but not the prettiest looking thing... but not that hard to hide if you have leaf litter in your tank already. If I am not mistaken this idea was passed on to me by Eric M, correct me if I am wrong Eric.