Randy Holmes-Farley
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My Tank Thread
The goal would be to keep Alk and Ca stable with a water change, but after doing a bit of research, it appears this Fritz Blue box should be pretty much right on the money. A few 10ths shouldn't hurt anything. It's margin of error is 8.1 to 8.5 and the goal is to hold 8.2. I don't think that I have anything to worry about.
That sounds reasonable. If a salt mix is close to the tank parameters, there's no issue. if it is well off the tank values, it is still reasonable, you just need to do more, smaller, changes.