Corals Bleaching or Attacked??

[AquaBert]

Hi All,

I have a 9 month tank with normal parameters.

78 degrees
Salinity 1.024
Ammonia 0ppm
Nitrite 0ppm
Nitrates 0ppm
Phosp. 0.04ppm
i have a refugium with Chaeto doing well!
Tank Mates: clown, lawnmower blenny, astra, nitrite, couple of hermits, soft coral, los, sps Birdsnest x2

Problem: no change in parameters for over 4 months. All of a sudden, my corals look like they are either bleaching or being attacked…

what do you think??

 

[Dave1993]

0 nitrate is not good they are starving to death

 

[AquaBert]

I’ve tried to bring that up and no luck lol

also, I’ll have to pay attention to my Alk as it sits slightly below 8

 

[Dave1993]

I’ve tried to bring that up and no luck lol

also, I’ll have to pay attention to my Alk as it sits slightly below 8

buy bottled nitrate and dose it