A. gracile probably wont eat right after metamorphoses from my experiences with them. Him not eating for five days is fine, that's not that long.
This species generally doesn't do so well in captivity in my opinion, because they seem shy and don't want to eat, so this is kind of a common problem with this species as far as I know.
Also, you need to get this guy into a mostly terrestrial or terrestrial setup. After metamorphoses they become completely terrestrial for several years. So you should give him a setup with deep dirt ( for burrowing ), bark rocks and moss for hides, a small water bowl ( or you could just mist the tank ), and some fake or live plants. Make sure its dark, moist, and has prey items that you can leave in the tank, like woodlice. Also you can chop a worm and put a piece in front of him and just leave it there, he may eat it.
Hope this helps. -Seth