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Rule #1. Don't dose unless you need to.
The corollary is that if you aren't testing, you can't know if you need to dose.
So, if you haven't, track your Ca and Alk for a couple weeks. Find the rate at which it is depleting.
What I meant by water chance is that if you want to replenish Ca and Alk you can directly dose those or you can do a water change since the makeup water will replenish levels of both. I had a 29 gallon but it didn't have too many stony corals so I just changed 5 gal/month and that replenished the levels. Once I set up my 125, it took a year before I started depleting 1 kH/week. At that point, I decided I had to dose to keep up with coral growth because I don't want to change water that frequently (N and P aren't a problem either).
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