How big is he? Hard to say from that pic, VATF usually have color on both top and bottom of the back fin but the pic he looks to only have red on the lower lobe. Plus he looks fairly silver, VATF normally have striping, but again, if he's really small then maybe he just hasn't colored in yet. If you've got any other pics of him, go ahead and post them up, maybe some of him from the side on so we can see the shape of the jaw? He looks good either way.