It sounds like they are addicted. I recently got some new adults that ate nothing I gave them for 2 weeks, including FDBW's, so I bought some frozen bloodworms and they devoured them. I guess it was all they were eating before I got them. Over the next week or so, I kept alternating bloodworms, frozen BH, Discus Chow and Tetra Bits and they eventually came around and now eat anything I give them.