For some reason I thought you were using a five gallon bucket. I'm trying to reason if ph would climb higher during the day if the lime was dosed all by morning thus, giving the tank a higher morning starting point, or if it shouldn't matter; the tank is still receiving the full increase? Just when I've completely stopped chasing ph numbers these things come by
My summer ph runs high topping out 8.5-8.6, so I switch to sodium bicarbonate added to my top off. During winter I have a hard time getting above 8.2.
Do you know if there is ph where CO2 has reached its saturation point is in sw? Last fall I heard a weekend radio show talking about the plight of the Pacific MW oyster industry. It said there is a ph point where the larva can no longer begin calcifying a shell; I thought they said it is around 7.8.