seafood based diets are much better for the longterm health of the discus ( and all fish for that matter) . an excellent and fairly cheap discus food i used to use was
1 mug squid
1 1/2 mug prawn
1/2 mug hikari pellets
big douible handfull blanched spinnach
1/2 cup cooked shelled peas
5 cloves garlic
5 crushed multivitamins
5 crushed spirulina tablets
1 VERY ripe banana
the fish loved it ate like pigs, grew like weeds and if i remember rightly it cost me about a tenner to make and lasted about 2 or 3 months