Adding far more alkalinity then calcium in my 2 part, Why?

[Mustangtodd97]

I am adding almost 3x as much KH as Ca. Using Red sea MG, KH, and CA. Adding almost 75ml KH, 25-30ml CA per day. I have an in-the-wall tank, so no sump, ato, or dosing pumps (no room) . Around 35-40 gallons of water. LPS dominant with a few easier SPS. Tank is a little over a year old. I have about 50 corals in there. Adding the KH 2x a day (morning and night), and Ca once a day at noon. Pamameters are MG 1320, KH 6.5-7.0, CA 420, Sa 1.026 NO3 0, pO4 .03. Testing parameters (KH, PO4) with Hanna, the rest with Red sea. Checked the KH with both. Confused as to to why i am adding so much KH and can’t seem to get much over 7DKH? Also switching from red sea 2 part to either B-ionic or BRS. 2nd question is which is better and why?

 

[CC13]

Following

 

[ckalupa]

Red Sea is the one two part system that are not dosed one for one. I dose the same offset like a four to one ratio. Part three (Mg) is like 10:1 to the alk.

Take a look at their recipe guide on their website and you’ll see their recommendations.

 

[Randy Holmes-Farley Verified Community Expert]

As mentioned, not all two parts are designed to dose 1:1, even some that claim they are (Seachem Reef Fusion, for example)

Balanced dosing is about 18-20 ppm calcium and about 1 ppm magnesium for each 1 meq/L (2.8 dKH), regardless on the mL to get there.