Try feeding a feeder fish (preferably saltwater) such as Molly's or guppies if you have some live ghost shrimp chuck a few at him. I doubt he will resist. Note if he hasn't been eating for a while it is wise to gutload the feeder fish to get the toadfish plumpyI've been taking care of an orange toadfish at the LFS that I work for, along with a mexican dragon eel (who is a beautiful eel,) along with some triggers and puffers. On a side note, what are some good ways to get a wild toadfish to eat well?