Just read this, fun read!
Great tank and build!
Seems like some frustration with alk and calcuium reactors. But otherwise getting dialed!
My buddy runs a dastaco calcium reactor. Loves it. Seems simple enough. Deltec makes a similar automated design that reef builders like.
Personally ive been running kalk slurry on a smaller tank, dosing with ghl doser, and its going so well i bought a large mrc kalk reactor to run slurry for a 200 gallon going up. Just use the reactor to mix and dose with dosing pump.
Maybe read up on kalk slurry as an option. You dont try to get all of kalk to dissolve so no issues there. Just be heavy handed with the kalk solution, mix and dose many times a day in small amounts. PH stays high, kalk is cheap, and simple for me. Dose some trace and call it good.
Just an idea if you're look to simplify.