Are you new to the fish-keeping hobby, or just new to puffers? If you're new to the hobby, you'll probably have some work ahead of you (unless you actually got good advice from your LFS). If you're not new, then we have some good articles in the library about feeding and general maintenance for you new puffer!
Add in snails to his diet, and you'll have a happy and healthy puffer. Stick to Apple snails, Mystery snails, Pond snails, or Ramshorn snails, and avoid Malaysian Trumpet Snails (the ones that look like spiraling cones) because their shell can potentially cause chipped teeth for your puffer.
You can also try feeding him green veggies (anything that isn't iceberg lettuce). Most of us have had success with peas, broccoli, cucumber, etc. If he doesn't eat it the first time, keep trying it the next day, because there's a good chance he doesn't recognize it as food yet.

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40 gallon - Future home of Abei Puffer
28 gallon - 1 Abei Puffer (Captain Abe)
5 gallon - 1 Betta (Frederico)