My blood was super picky and was fed live at the breeder. It took a long time and a lot of tries but he finally switched to f/t. Still working on getting his switched to rats consistently. He prefers mice. I did end up feeding live a few times to make sure he would eat. Something that worked for me was using a smaller prey item (f/t), smaller than what he could take and making sure it's VERY warm and heated up. I found that sometimes he would strike and just not be interested. I tried leaving overnight but that never worked. The only times he ate was when he'd take and coil it right away.
Make sure he has a nice hide, mine always stays in his hide. I don't measure or do anything special for humidity with my snake room.
I took a screenshot of my tracking so you can see that it took persistence and patience to get him to finally take f/t. You can see how spread out the feedings were as well. He'll still refuses sometimes, especially if it's not heated up.
So be patient, keep at it, feed live if it's starting to go too long with no food and good luck!
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