March 2nd 2010. Last one was 2-1-10 This is just to show you how much adding calcium to your reef can help your coraline algae and your corals. I added rock that was naked one month earlier. I plan on doing this every month for a year. Step by step to show how it's done. Check out my blog at aquatic jungle and drop me a line. dustinsfishtanks, Dustin Wunderlich.