Monipora coral bleaching

[coralcollecter06]

My 2 montipora’s green and red starting to bleach out of nowhere. From top or some edges in. All soft corals doing great. I ceased water changes for 2 months to raise no3 and no4 to detectable as I’ve always had to clean of water and was battling a cyno outbreak. Tank 2 years old. Been reefing 10+ years and am just no starting to dos po3 and po4. Currently no3 is 1.5 and no4 13ppb. Lighting hasn’t changed . Any input would be appreciated . No nudibrnches seen.

 

[Spare time]

Any issues with alk, calcium, magnesium, etc. stability? What all do you dose?

 

[coralcollecter06]

Alk: 7.5
Cal: 500
Mag- normal
All stable for 2 years

 

[Spare time]

Hows the flow?

 

[Spare time]

My main guess would be low nitrate but I figured I would check the rest.


It wouldn't hurt to dose some amino acids in the mean time.