You relaly should have looked into their care before aquiring one but anyway, Zebra plecs prefer a more protein based diet, ie more meaty foods. Bloodworm, daphnia, prawns, mussels, beefheart etc are all foods readily accepted by L46.
As for being able to hand feed it, I would of said it's unlikely as zebs are generally pretty shy creatures who dart for cover as soon as they see movement outside the tank.
If you want to know more, then go to www.zebrapleco.com
Darkstar.