Is your tank heated, filtered, what size? Was it properly cycled before adding the new fish? It has only been 2 days, keep going to the tank so he can see you, stand or sit next to it so he can see you do it frequently if possible for several minutes at a time, he will begin to respond. As for feeding, get a quality pellet such as New Life Spectrum, offer a pellet once a day to see if he'll eat it, if he does great offer him another one, if not try again the next day. Patience.