I used to use RCS for the longest time with non-issue, stepped away from the hobbie for a couple years, came back a year ago and just not happy, I dose and keep my tank parameters very stable, every week I make my RODISW and pre test the parameters and get some small levels of phosphorus in PPB with is okay, but the cal and alk is all over the place..my mixed reef uses 2.5 mils of alk per day and 1.1 of cal per day, nitrate are 0 and ready to start dosing that but my cal is always sky high for 3 days after a water change, like 530, and mag too 1400, I think I'm going back to brightwell or red sea pro, whats funny is my alk... before WC its 8.4 after its barley goes up th 8.6, next day 7.9 and I have to start dosing alk, has anyone had these type of issues? My ckrals look fine just frustrating