So an Alk swing of 0.9DKH by adding kalk at night to maintain stable pH is a lot less swingy than a pinned total alkalinity and a wobbly pH (8.3 to 7.9), excellent.On this topic of pH and alk, folks may find this thread relevant. We discussed what it might mean to a coral to have either one or both stable and what it actually means from the standpoint of their ability to attain carbonate for calcification:
Alkalinity stability? pH stability? Are they even different?
It is currently the dogma of the reef aquarium hobby to say that alkalinity stability is very important for SPS corals, and that pH is not. Often, the very idea of someone trying to optimize pH is called “chasing numbers” as if that statement by itself shows it to be foolish. Since I have...www.reef2reef.com