Rough necks are very misunderstood and very little is known of the wild habits. I read a paper by Daniel Bennett reviewing literature on rough necks, and it almost seems like no two have the same food preference. Just stick to what you know and experiment with different stuff. Try larger insects, like roaches and grasshoppers. The insects your offering might be to small for his or her liking. Monitors can be simple to keep, or extremely confusing. Rough necks are extremely interesting lizards, they just look like aliens! I want to work with them some day and I would love to try to breed them. Gook luck! And read, read, read, and then read a little more.
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Jason