tmack
Fish Crazy
it's worth mentioning as well that nitrate test results are always dodgy. the technology needed to test accuratley just isn't available to the average aquarist. The test results should be viewed more as an indication of the level rather than an accurate reading and you should always follow the instructions very accuratley even if they seem quite onerous.
ITHURTZ: As Miss Wiggle stated, the API test kit for nitrates can indeed be dodgy, and I've also found the strip tests very undependable. If you get the API test kit, read the instructions I got from API that I posted a while back:
http/www.fishforums.net/index.php?showtopic=180830&hl=
As I found, even if your test kit is new, the solution # 2 of the nitrate test can settle out pretty hard on the bottom of the bottle. Simple shaking may not dislodge this settled out reagent. I now bang my plastic bottle a few times on a hard surface and shake it for a few minutes to ensure that I'm getting a good nitrate reading.