whats the
PH
Temp
Alkalinity
Calcium
Salinity
Phosphate levels
how have these been trending........
I am trying to establish if this has a simple water based cause, when I started I totally underestimated the importance of checking everything.....
Also Whats the Phosphate level in your RO/DI type evaporation make up water.... Fish can take an incredible ammount of "abuse" rock and corals so much less.....
there is so much when starting
Lighting
circulation
skimming
fish
coral compatibility
water change routine
ca,mg,salinity,ph, on and on, its easy to get TOO focused on a few and start to ignore something else, which can be ok for a while but the cumulative effects starts to impact the closed system.....
I cannot say enough personally tho to regular 10-15% water changes....