I don't breed grasshoppers, but my friend did once. He used a 10 galon tank with a lid. There were about 5 males and 5 females in it. He had the tank lined with paper towels. He also had twigs and grass in the enclosure. On the bottom of the enclosure he had a flat heater to keep it a stable temperature(80-95 degrees). In like a shallow dish, he put damp mulch and that was where the females laid their eggs. He then waited a week to remove the eggs from this enclosure into another one with the same temperature. The eggs should hatch 2 weeks after removed from the adult enclosure. The adolescents should be able to eat grass also. I saw my friend put cut grass and wheat into a dish that had water in it for them to eat.