hmmmm....how old is he? maybe make a regular cool hide for him. Then just take some extra steps when he goes into shed. Spray the tank each day. ?? Are you offering F/T? If so maybe try live. If you are offering live...then maybe prekill it and leave it overnight in his enclosure. My bee is being quite picky lately but if I kill it and put it in his enclosure he will take it in an hour or so. Also you can try putting it in the enclosure and covering the tank with a towel so it is dark in there...then just walk away. Just make sure that the feeder is dead. Good luck.