Just keep at it, they should soon take to it. Also, try mixing both foods so they may get a piece of the pellets as well. Try smashing a small pinch of pellets in between your fingers and rub your fingers together as to crush it up a bit, they may start to feed on smaller pieces. They'll come around. Do you have any frozen foods for them? Mine seem to love Mysis Shrimp soaked in a garlic based liquid called Selcon. I also feed them Formula 1 pellets, frozen krill and silversides blended together. Often the garlic will get the to eat something they might otherwise pass on, they love garlic. Hope this helps somewhat. Good luck.