LOL cute little guy. I've not been able to get any of my geckos to take dubia yet (my gargs, leachie, or cresteds). I'll have to try again. Do you leave his in a dish for him at the bottom of his cage? I'm thinking I may have to try that as opposed to tong-feeding.
IMO the only disadvantage to cresteds is that they are nocturnal. I hardly ever get to see mine awake since their cages are in my reptile room.