Agree with Chen. I got my RTG in Aug 2009 and he ate nothing by super worms. no shrimp, no aro sticks, nothing at all,
when he adjusted to the tank, I introduced shrimps, maybe even 5+ days and he would not eat, but eventually he started to eat a little shrimps,
which now I stuff with aro sticks or hikari massivore. some times he would chew and get the pellets and eat the shrimp, picky bugger. It has taken me also most a year to get to this stage.
since your fish is still fairly young, I would start now with this tarining. When older much more difficult.