That's good to hear! He was probably just getting used to the new environment. Plus new fish usually take a day or more to get used to a new environment. It took goblin a week to eat! For the reflection I've seen people just put paper up.
He is doing better! I'm pretty much positive it's not velvet, but I'm still watching closely. He has been eating normally, not pacing as much, and seem pretty content. I think he might be able to see his reflection in one of the sides of the tank, cause he keeps swimming up and down it wiggling like crazy!