Are you trying to feed adult dubia to them? Do you use a feeding cup? If you have been feeding something " candy like " to them such as supers, they may be spoiled and not want anything else. Also some of my chams seem to prefer different feeders depending on the weather and time of year. How often do you feed and how old are your chams? Adult panthers can go quite a few days without eating. You may want to wait three days and offer them again, provided your chams are adult size.