Make the orp probe the last you add. There is much debate about what orp can really tell you. It certainly is not as easy as "orp should be X". When it drops, it suggests that something has changed, but you don't know what.
You can manipulate/control orp with ozone, bit even that can be tricky because the orp readings can be normally erratic.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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