Been having some trouble recently with my sps. A few are starting to look quite sad and seems like i am about to lose one and one is already lost. Basically, most of them don't have as vibrant color as they had in the past and the flesh has started to come off of the one and that is basically what happened to the dead one. Tank parameters today: pH 8.5 Hanna probe salinity 1.026 Refractometer Mg 1620 Salifert Calcium 440 Salifert Alkalinity 10 dkh Salifert Phosphate 0 Salifert Nitrate 0 Salifert Have had some issues recently. RODI was giving me ~20 tds which did not make it into the tank. Replaced all the filters: sed, carbon, ro membrane, and di canister, all spectrepure except for sediment, but while i was waiting for funds for the replacements the water level traveled a lot. So Salinity has not been stable for about 2 weeks but has been for the last week. This also put a halt on WC for that time period which I have switched back to Red Sea Coral Pro since all my levels were great and I was getting great growth from it before. I had switched to Seachem Reef Salt because i am a cheap bastard but will never make that mistake again. So I had to get salt as well which i received a day or so ago which i did a WC yesterday. So the parameters are what I have since the WC but i know the alkalinity was as low as 7 before the WC. Not sure if that has anything to do with the SPS issues or not. I do not dose Magnesium so I don't know how it is as high as it is. Also don't know if that has any bearing on the sps issues. The salt i was using never gave me levels of Mg Ca or Alk that i appreciated out of reef salt, hence the change, and the Mg would lower when using it so i don't know why it is high right now. The pH was steadily below 8 usually around 7.8 and 7.9 for the past several months and when I changed my rodi filters is when it decided it wanted to sit at 8.4. My Hanna probe may be off on its calibration on this. The only test i have to go by other than it is an ATI test kit which i don't even know if it is worth using. So, unfortunately I don't know how reliable that is at this point. I did start using lime water from my ato yesterday which probably is why the pH is up .1 today and I think this will help with keeping the calcium and alk at steady levels which they have not really been at in the past. So I am just trying to get some ideas as to if something I have listed here is the problem or if i should look into something else to fix the issue. Even my zoas aren't doing very well at this point, So I am open to any advice you guys can give me.