I feed the uarus and severums twice a day with pellets in the morning and either pellets or frizen food (discus tucker, seriously green, shrimp, bloodworms). The 3' with the heckelii, balzani, sajica etc usually get 3 feeds a day, two of pellets/crumble one of meaty foods. That regime + regular water changes has seen great growth and brilliant colours in all of them.
Oh, and the big ornate gets a few big pieces of shrimp chucked in every 1-2 nights after lights out.