If you are interested in getting answers to most any reef tank chemistry questions, you should post the question in my reef chemistry forum here at Reef Central:
http://reefcentral.com/forums/forumd...s=&forumid=112
The forum that you are presently in is for questions directly relating to my articles at reefkeeping.com. If I don't have any recent articles, I often don't check here for substantial periods, but I check the other forum daily.
Happy Reefing!