For a tank your size, a calcium reactor would probably make the most sense, especially if you have lots of SPS. It's fiddly to set up, but once you nail it it's set it and forget it. I know, because I went from manual dosing to dosing pumps to calcium reactor (plus kalk). I found the routine of constantly having to make and replenish the Alk and Calcium solutions annoying.
Just my $ 0.02
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