Ok, I was under the impression that the pool calcium was the steroids of hard corals.
What is acceptable for WC's anyway? I was initially set-up as a nano-style with only 29 gal (recommended 5-10% weekly) and no skimmer, etc. Now with the addition of my 15 gal sump , skimmer, more LR, etc, I have dropped to ~10% bi-weekly. No noticeable changes really in anything I can measure. But I'm assuming that is covering me on trace elements?
Edit: sorry for this seemingly elementary question