Okay, first of all, what additives are you currently adding and in what increments. What test kit did you use, and did you run more than one test to confirm 800ppm? That seems nearly impossible to me. Not saying it is, but my lord that would be a new record at least for this guy. Lets start there. I don't think you are in any immediate danger, so relax and lets figure this one out.
Here's to swimmin with bowlegged women.
Reef with 30G Sump/Fuge Combo
-30G LTAnemonarium with mated porcelain crabs, 10 sexy shrimp, and 2 pink skunks all tied into the other 135G in my system.