c- balance, how often, how much, on softy tank?

[randymon]

I have a 55 gal mainly soft with a couple lps reef tank. After 2 yrs, some of my coraline is leaving and Ive decided to start a two part additive. My cal is 400, alk. 3.2, and ph 7.8. & Pretty much stays there with monthly water changes. My question is with my tank, how much and how often? Oh yea I run carbon 24-7 in my refugium.

 

[Travis1]

I would say none. If water changes keep it at 400ppm ca and 3.2 dkh then why add any?? Those levels are adiquate to maintain coraline... LPS and softie corals.