No, I do not have a calcium reactor. I only recently really really started paying CLOSE attention to my calcium and alk levels. I usually did i for a while, then got away from checking, then started back. But since I have started getting some SPS I have been watching more closely. I can really say that I did NOTHING special for it. I would occasionally feed it a small piece of shrimp or some meaty frozen food. The only 2 part additives I have used so far are the Kent part A and B to keep my levels around where I want them. I have been using Kalk for all my top off water replacement for about 2 months now and I have been able to tell a big difference in the looks of my tank in general. If you have any other questions please ask.
Joe