Agreed. Baby and juvi g-cat ID is hard even with excellent pics. Too many look-alikes and too much variability within species, as Yellowcat pointed out. I'd let him grow to maybe a foot and then try again here or better on PlanetCatfish - I know there are great g-cat-ID experts there.
As for the hand feeding, you have to wait until the fish is not scared of you approaching and opening the tank. This will occur when the fish will associate you with food.
Then, making sure you have nothing bad on your hand (soap, grease, deodorant, perfume, make-up, lotion, etc.), take some food in your hand and offer it to him. It may take a while and lots of patience. The good thing, once he learns, he will stick to it.
