i feed my tangs a mixture of green,red and brown algae strips also formula 1 and 2 flakes...some brine and mysis shrimp...plus i leave the algae to grow on my back panel of the aquarium for them to graze on and they seem to be doing well on that diet
seaweed salad and nori every day.
mysis 2 to 3 times a week.
cyclopese 2 times a week
live brine whenever available.
formula 1 and 2 flake.
thats my feeding chart
Whatever you decide to feed, just be sure to keep it diverse, with a heavy emphasis on algal matter. Otherwise, there are no hard and fast formulas or anything like that.