I've set up a tank, which at the moment only has a couple of clowns and cheato luckily.
It's a barebottom with Aquaforest rock. Since it's a new tank with no corals, I've not checked Alk often, only NO3 and PO4.
I use RO/DI, which I check regularly, and my instant ocean mixes to 11 dKH, but, I...