I don't have any testing kits yet, so I took a sample of my water to a local fish store and they tested it for me. They just used test strips, could it possibly be that there was a small nitrate reading and they just didn't compare the strips to the color charts good enough? I'm going to get some test strips and test the water myself.
Don't bother with strips... Inaccurate and expensive! Try this
http://www.amazon.com/gp/aw/d/B000255NCI/ref=mp_s_a_1?pi=SL75&qid=1349812858&sr=8-1-spell
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*Go S. Vettel #1 rb8--5 MORE RACES LEFT! LET'S MAKE IT 3 BACK TO BACK WINS/WDC!* :beer: