The 1 point pH drop
Yesterday my pH measured 6.5 right before my co2 came on.
By the time my CO2 was about to turn off, about 8 hours later, my pH was at 5.95 but my drop checker was straight yellow.
I've been trying to get near a 1 point pH drop on my tank and was wondering how accurate this is.
Is it a 1 point drop from before the lights come on? Or a one point drop on degassed tank water?
Is it safe to assume my degassed water would have a higher pH than 6.5, and I shouldn't drop my pH down to 5.5 in order to achieve the full 1 point drop?
Should I let my tank water sit out for 48 hours in order to get the base reading? Then drop a full point (or 1.2, 1.3) from there?
My KH is 2 or 3.. I'm due for another reading. I use 80-90% RO/DI to Tap.
Any help would be appreciated.
edit: just took a reading on some tank water that's been in a shot glass for 18+ hours. 7.15 pH