I have a tank full of picky eaters that each demand different food. I have hikari gold, NLS, blood worms, and brine shrimp. All my fish will eat blood worms, but only the large EBJD will eat the hikari gold. I have starved them for a week in the hopes of breaking their wills to accept NLS, but they refuse to touch the stuff. Are there any tips or tricks to train your fish to accept other foods?