Portions of polyps on a couple SPS frag not extending - should I be concerned?

[djryan2000]

I've noticed that on my two green digitadas theres a side where the polyps are lacking extension. They're not entirely retracted as I can see the green, and when I touched one to move it it turned bone white until they came out. From the front viewing panel they look great but when I check from the back corner I see the sections with less extension.

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[outssider]

you may be hitting them too hard with that pump on the side, hard to tell how far away that pump is ??

 

[djryan2000]

you may be hitting them too hard with that pump on the side, hard to tell how far away that pump is ??

It's a little under 2 feet away


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[jeremy007]

What are the parameters?

 

[djryan2000]

What are the parameters?

Whoops. Definitely should have posted those in the original post

Alk - 8.9 dkH
Magnesium - 1380 ppm
Calcium 420 ppm
Phosphate - undetectable, but using salifert kit so I'm skeptical
Nitrate - 10 ppm
Salinity 1.026
pH - 8.15
Temp - 79 degrees F

For some background, I have 14 SPS frags in here, including other digitada. It seems to just be the green ones that do this and I'm questioning if it is flow.


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[kfisc]

Perhaps a lighting problem? Color temp or intensity going off a bit?

 

[djryan2000]

Perhaps a lighting problem? Color temp or intensity going off a bit?

Maybe - I never thought of that. BRS did a video on my lights and tested PAR and spectrum and I just set it to their recommendation. So that's definitely a possibility.

I believe it's flow related - I drained the entire tank to remove a fish today and my rocks got knocked over. I put them back together but they're moved about an inch or so and it seems that one of the two is now completely open and happy.


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