Red Montipora cap gone pale

[snorvich]

Water parameters?

 

[Ifeelsick]

Water parameters?

Hi snorvich

KH = 9.7
Mag = 1425ppm
Calcium = 440
Phosphate = 0
Nitrate = 6ppm approx after water change today. As high as 25ppm last Saturday.
PH = not tested

Thanks