I feedmy polys cut raw shrimp, earthworms/nightcrawlers, krill (freeze dry), floating/sinking pellets, algeawafers, crickets, frozen fish, smelt, and beefheart. also Frozen Discus Formula cubes.
Mine isnt fussy at all, it was eating shrimp pellets about an hour after I got it [was in the bag for 2 hours driving home from LFS]. Also loves bloodworms and beefheart.