It took two weeks to get mine to eat. Had to get live brine to get him started (this was after a week+ of no luck with all sorts of offerings).
He'd get so excited over the live food. First I'd immediately feed frozen afterwards and he get fooled for a couple of bites. Now I offer frozen first...he gets to the baster first and eats. Since I just got more live food before he seemed to make the switch, I feed from what's left of the live after the frozen. I didn't even get to having to mix it together at feeding time.
What's left to get him eating is nori. I've got a couple of kinds, put it everywhere (clips, rocks) and he won't go near it. He watches everyone else go for it, but hasn't tried it yet.