Update: After seeing my SPS /acros dying off over the last few months and my Cheato was also dying back ( see above) . So, finally got off my lazy backside and started testing instead of just doing water changes. Results: Tank Alk was 16 DKH , Mg 1050, Ca+ 350 = Hanna checkers and PH of 8.3 via probe. Salinity still read high - What the heck!! So, I found my pinpoint salinity reference calibration fluid and sure enough - the new refractometer I got was off by more than a bit- so calibrated it and now my tank salinity was 1.023. OK- so salinity was never the issue - so if I am not mixing my new water incorrectly - then why is my ALK so high - beside putting kalk ( 1 teaspoon /5 gallons) in the auto topoff ? So, I tested my water mixing station new water (Reef Crystals) and I got 14.2 DKH with salinity at 1.025= yikes!! SO yeah- found the issue.... Certainly, all this trouble is my own fault as everything was going well thru summer and early fall - so got lazy and had not checked ALK for months as I do water changes pretty faithfully. Whats weird is the Alk is that high, but my calcium is low. The tank is a mixed reef tank with the SPS/Acros dying off ( as stated above) so they should not be uptaking the calcium and usually I found softies/LPS uptake Alk faster than Calcium. Hmmm.. So, as a safe remedy I just purchased the Red Sea blue bucket- will post parameters of that water using my PH probe and Hanna checkers (ALK/Ca+/Mg+) later today.
Just tested my QT tank after I put in 30 gallons of the newly mixed Reef Crystal water and Ca+ is 464. I figured why waste the new Reef Crystal water- fish don't care about the high ALK. Now mixing up the new Blue bucket salt.
Edit/add on : Red sea Blue bucket new mix results : 1.025 salinity, a PH of 8.4, Ca+ is 515, Mg+ = 1320, Temp is 76 degrees, ALK is 220 on Hanna checker = 12.3 DKH- NOW WHAT! I guess I will let it mix overnight to see if that helps as that level of ALK doesn't really help much in my situation. So, since I am NOT doing a 35 gallon water change today as planned- I added 1000ml of the BRS Calcium Chloride solution to increase the Ca+ in the tank to around 400.