Stylo and Monti question

[Llg]

Hello. I have had these two corals for months. I noticed that the style has always been a bit white on the portion close to the tank wall; however, recently, it has moved to the front. There are still polyps, but the skin is white.

Today, the montipora is also looking a but retracted. Any thoughts on what this may be? My rainbow style is fine and has been in the tank just as long. I originally thought the shrimp was eating it. Once the shrimp was gone, it did get better. I just got new hermits. Would they be doing this?

Salinity 1.025
PH 8.9
Alk 10.1
Ca 480
Nitrate 5
Phos .04

 

[blaxsun]

It's unlikely that it's the hermits. How's your magnesium?

 

[saltyfins]

could be that the light isnt hitting that part. That's what mine does also

 

[Llg]

I haven't checked magnesium. On the stylo, yes, that was my thought as well. Maybe I will try to move it a bit and see. It is generally happy in that area