<a href=showthread.php?s=&postid=12605668#post12605668 target=_blank>Originally posted</a> by 2thdeekay
I think if you recheck/cover all the basics, including water parameters (properly calibrating your refractomer, or checking for an electrical short, for example), you'll have covered all your bases.
Perhaps you have reefing friends in your reef club who can help you take a step back and look for a solution. I'm not sure spending $ on lab testing will find your answer. The neat thing about reefing is "you are the expert" on your own reef. "The more I learn, the more I realize how little we know..."
Hopefully, your solution will be something simple to correct, and not an unknown. Sorry I don't have a better answer. Best of luck to you.