Have you tried f/t and live both? My Black Widow male used to eat f/t rat pinks when he was tiny along with f/t mice, then was eating just mice, and when I tried to offer him a f/t rat he wouldn't have anything to do with it. Put a live rat hopper in his cage and he was all over it immediately, after three weeks of not eating while I tried to get him to take a f/t rat. Only one so far - that was last feeding, so I don't know if now that he's taken a live rat, he'll take f/t rats as well.