The title is the question. I recently noticed a pretty large drop in Alk. I am attributing this to demand, as I have literally had an explosion of growth of both coral and corraline in this tank since setting it up. It's clear to me that WC's are not going to keep up with the demand. So I was going to start Kalk in the topoff but I really don't want to deal with having to clean the resovior every week, plus I can get it out of the stand without moving the sump(poor planning). In light of that I have decided to move on to dosing 2 part. Manually at first then dosers when I get them. That said I know I have to get my number where I want them then figure out the depletion rate to determine how much to dose.