Hi Bart
I keep them in a small plastic container with good aircirculation, about 5 cm (2 inches) of leafs from the forrest, that i keep moist at alle times. Leafs are mixed with rotten wood, since i have read somewhere that they eat it. Beside leafs and wood i feed them with fruit, which they seem to prefer over vegetables.
I have only had mine for a month or so, but my first nymphs are adult now, so i hope that ill get some offspring sometime in the future.
Regards
Kenneth