I am asking because my fish and two of my corals (mushroom and palys) are doing great, but my coraline algae has died, a brain also died, water parameters have been good and stable for the last 6 months, only thing my salinity once got to 1.028 because my source of RO went on vacation (LFS) and i was hessitant to use tap water, only thing i found wat my lamp was leaking some lectricity in the water, i noticed once when i fed the corals barefooted, not a big shok just tingling in a cut i had in a finger. I took care of that and now I am waiting to see what happens, the only other thing i can think of is temp wich is on 26-27C daily, kinda high for what I know.
Btw my sistem is a SERA MARIN 130 liters, i keep my salinity at 1.026, kh at 10, I use natural sea water for water changes, 20 liters once ever 2 weeks.