Hi, would appreciate any advise that can render .
my tank is 4ft. started 25 March.
Latest reading
kh- 9.5
mg-1280
ca- 430
no3- yellow (0)
using Red Sea salt.
2 wks ago , no3 spiked to 40ppm and dosed Red Sea nopox and Carbon to bring it down.
but sps are turning brown .
Appreciate any advise as to what happen to the tank.
Thanks