I haven't yet had the honor of owning Phantasticus but based on geckoes & other insectivors I previously owned try giving him a few more days to adjust to new surroundings before feeding him. Has he eaten crickets for you yet? If so then wait a few days add 1 cricket w/ the new prey item & it may go after all prey. What type of roaches are you trying lobsters,bannana greens,or another small species? I assume you breed roaches so prefer them. Give it a few days it 'll eat. Also when you move it to new enclosure give it a few days to adjust.