I can only tell you what works for us, and what has worked for the last 10 or so years. We feed our
our homemade fish food (blender mush), and nothing else, except for some supplemental seaweed for the Tangs.
We also run a calcium reactor, and a
kalk reactor to maintain
ca/
alk & pH levels, but we haven't always run all this equipment. My suggestion would be to feed the tank a good homemade food, and do regular water changes. The water changes will maintain your necessary trace elements. The only other "supplements" you should need are something to maintain balanced
ca/
alk. This can be kalkwasser, a 2-part dosing additive (B-Ionic or something similar), a calcium reactor, etc.
There are a couple exceptions to this "philosophy".
(1) If a reputable/accurate test shows a marked deficiency in a needed element, then by all means, dose. Do not dose anything you do not test for.
(2) Some corals appreciate supplemental feedings. Most
LPS like the occasioanl "wash" of finely chopped raw seafood. Gorgonians, sponges, clams, and some softies appreciate the additiion of phytoplankton.
IMO, photosynthetic gorgonians (we also have a purple one)
love high light, and moderate water flow. I make sure to take a turkey baster, and direct feed it (weekly) with a mix of our homemade food & phyto.
I've never (in 13 years) dosed marketed "invert food", magnesium, strontium, iodine, etc.
HTH,