Variety in food, plus color enhancers (for some fishes) are key in keeping fish healthy, vibrant and colorful. I would suggest some flake foods that have color enhancer and frozen mysis shrimps with Selco supplements. Also try variety in frozen food and nori. Brine shrimps, IMO, have minimal nutritional value.
For my tank, I use a home made blend of various seafood, fish liver oil, liquid children vitamins and Selco. I feed as many dried seaweeds as I can find, and use various flake foods from Brineshrimp Direct. My fish have very vibrant colors and many species are breeding in my tank. (Banggai Cardinals, Ocellaris clowns, Clown goby, Royal gramma, Mandarin, Flameback angel with a Cherub angel, Yellow tail damsels, Firefish. I also think Marine Beta also but not able to confirm the egg mass yet)