Discus flakes

Here go my discs even after weeks of getting used to not follow these flakes :-(
It all things were tried. In the morning first thing in the feed where the hunger of the animals is still the greatest,
before a few days nothing feed so the fish are hungry, in between times feed repeatedly flakes to mix with the usual frozen food and so on.
Unfortunately, nothing can be done, the lining remains unaffected. Only the neon and Rummy it eat very happy.
What I like are the large flakes which are certainly ideal for discus and other large cichlids.