Anyone know what’s happening here?

[Rob62391]

Got this tubbs stellata montipora about a month ago and within the last week and a half it looks like a section of polyps is disappearing. Anyone know what this is or what the remedy is?

Tank Parameters are:
P04 - 0.03
Nitrate 0.4
Alk 7.0
Calcium 430
Salinity 35

Running a radion g3 pro with the coral ab template at an overall brightness at 65% which at the peak of the day is saying it’s putting out 47%

 

[vetteguy53081]

Moderate light and water flow.
Assure ph range is 8.1-8.3
Temperature 77-79
Alk - 9
Mag- 1300-1400
Salinity 1.024-1.026

high salinity is a culprit. Increase whites just a little also

 

[I’ma tempermental coral]

Most monti’s like a bit more nutrient in the water. Any other sps in the system? Also all at 9 with that little nutrient tends to curb polyp extension in my experience.

 

[vetteguy53081]

At least my monti above 9 go south. At 9 they take off and that’s in 2 tanks and misist salt mixes establish a 9 when it comes to alk.
Below are my polyps and one of my Montipora

at 9 running a CA reactor:

 

[I’ma tempermental coral]

What are your nutrient levels though @vetteguy53081?

 

[vetteguy53081]

What are your nutrient levels though @vetteguy53081?

Low- running zeovit unit

 

[I’ma tempermental coral]

Interesting if my alk creeps up above 7.5 I start seeing less and less extension. Mine are normally sub 1 ppm nitrate and I have to dose phosphorus so my phosphate to bottom out.