2-Part/ Klak Hybird to raise/flatline ph

[SpSDrew]

In an attempt to stabilize pH and raise to average closer to 8.3 I am debating ditching the ESV 2 part, running a hybrid dosing, or going just to Kalk.

Tank system is around 150 gallons. (90 display, 60 frag tank, shared 20 gallon sump)
SPS dominated in both. I currently just dose ESV 2 part (50-60 ml/day). The skimmer does have a C02 Scrubber on the airline

I was looking at possibly turning off 2 part dosing during the night and running Kalk to limit the pH swing. The question would be as to how much to dose and if this method would work until I could slowly bring the system off 2-part and possibly only kalk.

 

[Randy Holmes-Farley]

Using kalkwasser at night does not usually prevent the nightly pH drop, but it can reduce it.

You could also use a two part that has the same effect.