Sudden drop in ph causes??

ibrat82

New member
Hi guys So I just checked my apex monitor and as of 3:50 PM my ph is going downhill and right now it's at 7.65. My ph has been steady for the past few days ever since I brought my salinity up to 1.026 around 7.8-7.9 but then this happened today. It drooped from 7.84 to 7.65 in 6 hours. I didn't do anything to the tank but alow more flow into my gfo reactor which only required me to adjust my valve by a mm so that can't be it.. What can cause a sudden drop?
 
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