03-20-2009, 05:37 PM
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I need help accurately reading API test kit
I've been cycling my tank for 4 weeks now and in 12 hours the bacteria are processing ~3.5ppm of NH3. I did a nitrite test for my tank using an Aquarium Pharmaceuticals test kit. When I was comparing the solution color to the chart in a well lit area I noticed that if I place the tube directly against the chart card the solution color is darker than if I allow space between the card and tube. This made the nitrite concentration reading be 2 ppm<n<5 ppm if the card was directly against the card and n=0.50 ppm if there was space between the card and tube. That's a big difference.
Should I be reading the tube away from the card or right against the card?