It's been a month and no one has posted, so I am hoping the worst hasn't overcome your frog. Iratus ranunculus is right, they really do need to feel secure in order to eat, more-so than other frogs. Is he still in the 10g glass tank? If so, I would recommend putting a background on all sides of the tank except the front. You could also use construction paper--that's what we do with the tanks in my classroom when the budget is tight.