Very cool, Chad is a good guy: maybe your Hog is a sibling of mine
I would monitor weights and keep offering once a week: also I would try putting him in a tub setup if you have him in a large tank. I believe that Chad houses his little ones in tubs in a rack setup and maybe your little one is feeling a little insecure in the wide open tank when it may be used to living in a tub. My girl is in a tub and ate no hesitation with me, and I have no doubts that she'll eat today.
If you consider a tub setup I can let you know how I have my girl's tub setup like.