Food
High quality food is essential to keep marine fish healthy and to keep their bright colors. A variety is always good. We recommend angel fish and tangs be fed a good quality flake food, dried or fresh algae, and maybe a frozen food as a treat. They should be fed at least one or two times a day. Trigger fish like more meaty foods, frozen is usually your best bet, but they need veggies too, the dried algae or flakes works great for them as well.
For corals, most of their energy is received from algae in their tissue, which grows from the lighting you have on the tank. Supplementing them with phytoplankton is also a good idea.
To keep your fish healthy (especially ich prone angels and tangs) several times a week, soak their food in Selcon, Vitachem, or Lick-Ich supplement. Dried algae is perfect for this. Then feed the fish the soaked food. This will boost their immune system, improve color, and often prevent or even cure ich problems.