This is one of the easiest feeders to raise but of my four chams only my latest eats them on a regular basis. I got CJ when he was about 5 or so months old and he had been raised with roaches being part of his diet. The biggest problem with them is getting the cham to recognize them as food because they don't move around much. They tend to cluster together in a motionless pile of bugs. I have seen it suggested to put a more active feeder in the dish with them so the cham can associate their presence with a known food source plus the more active insect can stimulate the roaches to be more active too. I am thankful to CJ's breeder for getting him acclimated to these bugs. They are loads better than crix in almost every respect.