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what is the best level to keep your PH at? just hooked up a apex controller my oh with the lights off and refugium on is 8.47. I do not know what it was with the lights on.

I have 108 3watt cree leds turned up about 65-75 percent 1/2 XPE royal blue and 1/2 XPG white . i took a reading of my led lighting i have from 180-220 par on my sand bed and 320-450 PAR as i get closer to the top with my leds turn all the way up i have 350-400 on the sand and 650-700 near top...

hello everyone new to the chicago reef site.......