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Message: <blockquote data-quote="pseudorand" data-source="post: 8260947" data-attributes="member: 133366">But how long do the instructions for the Red Sea test kit say to wait? Do you get different results if you wait exactly that long and then read again at 15 minutes? If so, how do you know which is more accurate?I typically set up ammonia, nitrite and then nitrate. All take 5 minutes per the instructions, but I start my timer after the nitrate test is set up and read all three when that goes off. This means I'm reading ammonia at about 9 minutes. I had assumed it converges on a value within 5 minutes and this should make no difference.But today I was going to test ammonia only, so I set it up and started my timer. Then I figured I should test nitrite and nitrate while I was at it. Much to my surprise, I got different answers.</blockquote>