I can't imagine they will make it impossible to eat, I just wouldn't keep them together initially because discus, wild in particular can be picky. I'm worried that if they go on together that you will have a discus or two that never start eating, but I might be overly worried because of Ray experience. Something to consider would be attempting to feed something new to the discus, they might all be too large for this to work, but I feed the 1mm NLS to my smaller cichlids and it just floats down past the chocolates because they don't really register it as good and they much prefer cichlid gold. I've also noticed that the chocolates prefer to eat either food as big as possible or they prefer sinking pellets to floating pellets but I'm guessing it's the former more so than the latter. My floating pellets are a good bit smaller than the sinking ones, bother hikari gold.