Bought a couple of growouts from someone getting out of the hobby on Craigslist. I sold me this puffer for $15. Not sure if it's Fahaka or Mbu. Tail is a little yellow-ish if that helps. Sorry for the crappy cell pics. He's about 2".
Btw, what size tank will your puffer eventually go into as it seems that its in a rather small tank for an adult?
Finally just as a side note, you may want to add a bit more decor in there as they appreciate exploring around their tank and hunting for snails etc...