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The water being in the car would not cause nitrate to do anything, if it's in the water it's in the water no matter what the temp is. You don't have your own test kit?
I added a few as an experiment then bought another 2. I have star polyps, yellow polyps, a plating monti, white zoanthids, and a Xenia. Every tank is different so make sure that your water is good before adding anything