If it makes you feel better I’m seeing a similarity in my tank. It’s going on 4 months old. I’m using BRS kalk in my ATO, but I’m seeing alk drop while my calcium stays pretty stable (testing with salifert). I’ve been using Randy’s alk part of his 2-part recipe to keep the alk up.
I was operating under the assumption that there are organisms using carbonate at a higher rate than calcium in my tank, coralline one of them. But this was just an assumption.
I was operating under the assumption that there are organisms using carbonate at a higher rate than calcium in my tank, coralline one of them. But this was just an assumption.