Hi I breed loads of fruit flies and springtails for the springtails I keepin a plastic tuperware about 8inches tall filled with coir to a depth of 3 inches a piece of cloth over the top of the tub fed on fishflake mushrooms and bits of fruit, tons of em . Ijust place a good pinch of muck in the vivs and the frogs sort em out. They are sprayed every 2 days and are kept in my roach cupboard at 94f Fruitflies masses of them raised in a mixture of ready-brek (instant oats) and apple juice with a large piece of cotton wool on top for the flies to climb on. Try culturing other foods such as bean weavills and grain weavills in case of a crash, plus growing your own food is just as much fun as keeping your animals.