Yesterday the doorbell chimed and the mailman brought me these: Prior to MACNA, I spotted a contest on Facebook run by Coralvue, the company that now carries Elos products. The contest was simple. Like it and Share the picture with your friends, and a few weeks later I learned that I was one of two winners. Pretty cool prize, since these retail close to $90. Alkalinity, Calcium and Magnesium are important tests for any reefkeeper. ...