1) Nitrate reducers (other than water changes)
Nothing added, but I utilize a Nitra-Gone De-Nitrator. I run Carbon in a home made mix of carbon and PhosBan in PhosBan 'reactor'. I am not sure Carbon lends itself to Nitrate reduction, but, like Prego, its in there. CPR SR4 Skimmer.
2) Phosphate reducers
See above. I have also utilized Phosphate reducing filter media in the past. They work well.
Selcon (Just recently started using it)
Water changes. I have re introduced Kalk
and also use Turbo Ca
to adjust levels. You just can't beat the happy corals you get with kalk
5) Fish food
MarineLand Flakes, occasional freeze dried brine, krill and once in a blue moon silver sides, shaken, not stirred. Of course sea veggies for the Tang and other Omnivores. More importantly is probably how often, but hey, its your post
6) Coral and invert food
The very rare use of Kent's Invert/Filter Feeder. This stuff can pollute a tank like nobodys business so Im extremely stingy with it. I usually let the dried food soak in it and the selcon. I do not target feed any of my babies
7) Anything else you can think of
Oceanic Salt kicks *edit*!!!