My Params are as follows measured with salifert test kits.
Alk = 8.5
Calcium= 450
Mag= 1350
Nitrate and phosphate really low I only check those maybe once a month
Salinity with refractometer 1.025
Water temp 79f
The few acros I've noticed with what I consider minor changes for now have been in the same place forever and are higher up in the tank. They get lots of light from my 5 Kessil 160's the same it's been the same since day one.
So at this point I'm figuring since I lagged a little on this latest water change ( been 3 months ) versus the regular 1.5 interval maybe that is the reason for the slight change in some of those corals. I've used Red Sea pro salt since day one.
Not gonna do anything drastic at this point since it's just a few corals showing negative changes and not the whole system. So I'm assuming a water change of 20 gallons or so is a good idea for know and will see if they go back to there normal colors and growth rates in the next few weeks. If there's anything that I might have missed any info would be appreciated, as although I consider my regimen successful I'm always up for any good advice.
This is a full tank shot from yesterday and the coral with the most browning and the one with what looks like dying tissue in a section of where it encrusted.