So I tested on Friday and today. Friday Alk was 8.9 and today it was 8.4. After my WC on Monday it was 9.3.
Would All4Reef be a good way to stabilize my alk along with the other parameters?
You're losing about 0.25 dKh/day.
All-for-reef is one option. There's also kalkwasser, balling method, 2 part, etc.
Note that your alk consumption is going to keep rising as your tank matures. Even without adding stony coral. Coralline algae consumes it, too. Do some research on the different methods and pick one.
FWIW, 1 square meter of reef in the wild is able to suck out 10-20 kg/year, and this rate has been observed in aquaria. Applied to aquaria -- it's entirely possible for a fully stocked tank to suck all the alk out of a tank in a single day. At some point, you're probably going to need to dose more than once per day to keep the parameters stable. Probably wouldn't hurt to start researching dosing pumps.
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