I think this hobby is a joy, to be honest if you setup right from the start. Im fortunate to have worked for Pat Donston owner of Absolutely Fish Marine Aquarium and I learned the hard way lugging buckets back when I was in college. Now, while I only keep LPS and Soft Corals, I find that setting up a tank with cultured live rock and good current flow and patience is 90% of the battle. Plus I subscribe to the Attrition Theory: -Over time, your system will develop livestock that thrive. Regardless of what you do, some will die off. But The residual Life are hardy. And that is a reality of keeping a reef. How many times I had numerous thriving corals, fish...etc... when I introduced a new one and it did not make it.
I keep WATER. And I strive to maintain my water by dosing and water changes. Filtration is a given. It was established from the beginning. The Live Rock is KEY. Established Rock with diversity of life. Good Flow over the rock. I keep Rock and Coraline Algae as much as I keep Corals and fish. My Coraline Algae are thriving. rich purple and pink. Rock crawling with Pods at night. That is the heart of a system, the Rock.
As for Ca & Alkalinity.... I Dose in moderation and maintain fresh water changes. -When I do so everybody perks up and brighten. So... yeah. I rarely test.