Is that the Duncanopsammia from the raffle?
Just use a turkey baster to target feed some mysis or pellet food when the tentacles are out. Turn off/down your circulation if the food doesn't stick to the tentacles.
They'll do fine just grabbing whatever food is circulating when you feed your tank/fish too.
If I have leftover food that my frogfishes don't eat, I'll give it to the Duncans sometimes. Not lately though. The Duncans grow too fast
