Ive never had trouble with getting silvers onto pellets, but one of my blacks had to be starved for almost a month before I tried a different method. I got tired of starving it and decided to toss cut up market shrimp one day. I turned around and all the pieces were gone. Then I started stuffing carnisticks into the small pieces of shrimp, increasing the ratio day by day. Eventually it just ate carnisticks, the other two blacks from the same batch took the pellets within a few days, this one was just a stubborn pita.