Kenya & GSP retract everyday same time

[BZreef16]

I have a nano that been running for about 2 months, Everyday around 11-noon, the GSP rock and Kenya tree close up for about 2 hours ....then open up slowly for the rest of the day. My initial thought is PH swing? I have a Mars fisher PH test so i cant see exact values......but it seems that morning and test and afternoon test are the same.

Lighting is another concern. I have a AI prime at about 50%. Theres a 3-hour ramp up that peaks at 11-630. Everything else (Monti, Mushroom, torch) seem to do just fine during this time and there is strong consistant flow though the display

Temp 79
PH 8.1
Alk 9
Cal 400
Sal 1.026

WC 50% every week
Salt: Reef Crystals
Dose: All For Reef 1.5ml/day

 

[blaxsun]

My guess would be lighting, but any minor pH swing could also be influencing it.