Stn has struck two of my sps and I think it's due to unstable alkalinity. Alkalinity was steady at 8.5 for months but then started to drop to low 7s (no signs of unhappy sps but I was worried so I upped my doser a few mls of 2 part b ionic. Then over like two weeks my alkalinity rose to 9.5. I backed the doser off a bit a few days ago and today I'm at 9 with Red Sea kit and 8.5 with salifert. I noticed stn on my green slimer two days ago and broke the one branch off that it was on and now today I see it on my bonsai not sure what to do next I know I need to keep monitoring my alkalinity and keep it stable anything else I should be doing? All other sps seem ok. 60gallon hex @ReeferMaddness843 @aaron23 @Diesel