Hi, I have 3 month old chicks that will not eat anything but corn on cob and crickets. I have tried to introduce lots of other things such as; worms, yogurt, strawberries, blueberries, grapes, scramble eggs, beans, peas, raw broccoli, cailfower, sunflower seeds and much more. But they turn their nose up. Crickets are getting expensive. Any ideas?