Breeding
Breeding crickets is a fairly simple process. Once the crickets are in the tank, they will quickly find the nesting container. Since there is no other substrate they will mostly lay their eggs there. As long as the nesting container remains damp, it should be full of eggs after about a week. Remove and replace the container. Cover the container full of eggs and place it in a warm location. Near the heat pad or emitter is usually fine. Make sure the substrate remains damp and in about ten days the eggs will hatch.
Once you see a bunch of tiny pinhead crickets, the nesting container can be moved to the new rearing tank and the lid removed. Larger crickets will eat smaller ones so moving the pinheads to the rearing tank is important for maximum output. If you only have two tanks, once a month move all remaining crickets to the rearing tank. Clean the adult tank and make it the new rearing tank.