I use RC and am getting low Ca and Alk on my tank. There are only a couple of small soft corals in there and some CUC. I want to pick up my Ca/Alk but without resorting to anymore equipment. What do you recommend I use that can be used with my ATO? What do you use and why? I wanted to try DIY 2 Part but can not find the ingredients ( I looked all winter ) locally.