spmnarciso-
Do you do regular water changes? From my small range of understanding, the water changes help to keep your water readings in check; such as PH, Cal, etc.
My water test were excellent for about 3 months, then they went nuts, I do vacuum the CC, but my Nitrates still went up to 20. Since I started feeding less (so much so that my goby ventures to the top of my LR looking for food), and due frequent small water changes, my Trate is back down to 10.
Maybe since you don't have all CC you may be ok, but I loathe the day I put mine in! I can't wait to get my new sand in there! :joy:
Yeah, I too would like to know the cause of all my Calcium!