Been reefing since the 90s and what has worked for me is keep it simple. For me that means let the biology do the heavy lifting. I have a respectable amount of live rock and sand in the display and sump. My filter media is floss and I use activated carbon, both in an area of high flow that I change weekly. I do a 5% - 10% weekly water change with tap water but ours is good.
I keep soft coral, a few LPS and have ornamental macroalgae to take up nutrients given off by my fish. I have no skimmer, no reactors, and no controllers. It's an easy simple system but it is nice and works for me.