ph should be at its peak during your peak lighting hours, rising when your lights go on, and falling when they shut off. I drip kalk
overnight to help keep it stable overnight at about 8.2 . the spike from kalk
is usually pretty quick. I like to keep a slow steady drip, it takes about 9hrs for a gallon, at least on my tank-a 55g. dont drip too fast or you will get a big spike. if you dont notice a ph increase look for other causes,such as excess carbon dioxide in your home, or low alkalinity. i dont really concern myself with ph other than letting the tank decide where it wants to be and help it stay there. the main reason I drip kalk
is to help with my calcium and alkalinity.