[Pescador]

Aragamilk won't bring your CA levels up. It is basically an aragonite slurry. You need a calcium supplement like Reef Complete (that has Mg as well) or the calcium part of a two part supplement.
Don't dose anything for your alk so it can fall and let your CA go up.
It could take a couple weeks to bring your level up until it's in balance with your alk and then your reactor will maintain it.
You can use a calcium supplement to raise your levels but to maintain them you have to use a balanced two part supplement or your reactor.