I need help

bigboy

Reefing newb
my 100 gallon tank is having a problem that I dont know how to fix. My corals are turning white and slowly going away. I have check everything that I know to check, calcium, PH, Phosfates.I have replaced the bulbs on the lights. I run a nitrate reactor(sulfur based) have not had any problems until about a month ago. things just started going down hill and I cant get it to stop. Any help would be greatly appreciated.:frustrat::frustrat::frustrat:
 
it sounds simple but a lot of people forget to check their salinity after evaporation and water changes and it can slowly increase too high.
 
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