I have had this problem as well. I just rescently got advantage calcium by seachem, and have been trying to dose my tank every day. I need to test my calcium levels again, but im hoping this helps raise it, mine was down to 350ppm, fortunately i dont have any sps!
I use Seachem's Reef Complete for Calcium and Seachem's Reef Builder for Alkalinity. That combined with using Reef Crystals keeps my levels pretty steady and high.
I use Reef Advantage in my make-up water and make a water change once a week religously. During the week, my topoff water is saturated with Mrs. Wages Pickling Lime. My ca rarely falls below 400ppm
I do 20% weekly water changes on my 12 and 2.5 gallons and add a bit of Kent 2 part solution in between. Seems to keep my calcium levels about where they should be. Having said that, I just added JBJ auto top-offs to both tanks with a common 10 gallon reservoir. I'm thinking about putting some kalk in there to supplement calcium since I now have a few small SPS.
Chris
Jeremy, I Have Enough B-ionic To Dose Your Nano For Years If You Want It Come To The House And Get It If It Will Make It Easier For You Just Call Me And I Can Meet You At 5dc
I have been using Brightwell Code A and B and may tank calcium and alk have been very stable since I started using them. What is B-ionic that everyone is talking about?