I cant figure out why my PH keeps dropping

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Jonreefer

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So my PH just wont come back up to normal.
Lastnight it dropped to 7.65 It has been slowly dropping more and more from 8.1 in the day to 7.9 in the day now going overnight to 7.65. Just a few weeks ago it was 8.2 during the day and 7.9 at night
I have a co2 scrubber on the tank. The weather has been better and have had doors and windows open alot more
my Alk is 8.3 Hanna checker
I just recalibrated my PH probe and it was just a tiny bit off when i checked it in the 7 and 10 solution before calibration.
It seems that it started to bomb when I started my flux treatment last friday dealing with Bryopsis. I tried holding out from using it but manual removal and my cleaner crew of hermits snails and fish couldnt keep up.
I am not sure if the Flux RX is causing the PH drop so much. Short of a huge water change not sure what else to try to raise it
 
Also its a Nuvo 20 size tank. I have 2 DMP10 wavemakers and a 200gph return on the AIO so there is alot of flow.
I have the front door open now and a fan ontop of the tank to try and blow fresh air onto it for the water to absorb cleaner air
 
My chart over past few days of it dropping
 

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