SPS corals turning white

[jai_12]

Hello reefers.

My corals mainly SPS are being impacted by something which I cannot identify. They are turning white and I am not able to control it. Any ideas?

Kh : 9.2 (+-20)
Ca : 480
Mg : 1338
PH : 8.04-8.27
ORP : 235
Temp : 25.8-26.1 celcius
No3 : 20 ppm approx

[Oscarhaglund]

Ska man tro amerikanerna så är kan det mycket möjligt vara så att du har något slags patogen i vattnet. Eftersom vi inte har tillgång till antibiotika här så kanske det inte är mycket man kan göra?

[kaptenen]

Any PO4 status?

[nike83]

how old is the tank?

[jai_12]

I had it for 1.5 years and recently upgraded to red sea 425. These are new coral frags which were doing quite good since few months but suddenly they started to turn white. I have done 40% water change this week and removed the parts which were turning white and treating the tank with Fauna Marin RTN/STN X for Tissue Nicrosis. I can see good results from last two days. I hope it continues but I still don't know what was wrong.