Fattening up a powder blue tang

[asylumdown]

I picked this guy up like a month and a half ago. He was emaciated, but not to "the point of no return" emaciated, plus he was (tepidly) eating pellets in the store, and was more aggressively eating mysis. It was part rescue, part impulse purchase. I gave him a full tank transfer protocol and a prophylactic round of prazi-pro, during which time I trained him on nori.

He's been in the display for... gack I don't know, 14 days after I got him, so a month maybe? He's put on some weight, but I can definitely still see his spine. At least his stomach area is no longer caved in, but when you look at him head on, his skull is clearly the widest part of his body. I'm wondering how long people who've 'recovered' powder blues from the brink of starvation remember them being skinny? He's an aggressive eater, particularly with the Nori, though it's hard for me to keep nori on the clip due to my aggressive hog of a cowfish (the tang can nibble for 6 hours on what the cowfish devours in 2 mouthfuls). But otherwise he's incredibly active, alert, and interactive. He's already lost all fear of my hand and will eat nori right out of my fingers. Just want to make sure he's on the right track.