This morning dKH in the tank was still 5.7 and the fresh mix of IO was dKH 9.3 which I think is accurate. I did a 10% water change and then dKH in the tank measured 6.7
This is a raise of more than 1 dKH point in 18 hours which is probably on the outside of the comfortable curve but fish and coral look fine.
__________________
|