More good info there RD!
I often hear a lot of people testing out new foods for their fish only to give up on it because the fish won't eat it after ______ amount of time. To me, this equates to trying to get Oprah to stop eating donuts and switch to broccoli. As long as there are donuts around, Oprah's going to eat them not matter how much healthier broccoli is!
If you're having trouble getting a fish to take a certain pellet, sometimes they'll make the switch faster if you lightly soak them in water to soften them up. This can have negative effects nutritionally (vitamins, etc. leach out quickly once wet), but the relatively softer mouth feel (no jokes, please!) often makes the food more attractive to fish. Eventually, you can eliminate the soaking.
A more "nuclear" approach would be to soak the pellets in an over the counter appetite enhancer (often made largely from garlic).