Well maybe. The problem with the API ammonia test is that .25 ppm might be zero, but it could be .25 ppm. If you have a dropping trend like 2 ppm, 1 ppm then .25 ppm followed by .25 ppm you are probably ok. what the heck Red Sea ammonia, I figure I can detect about .1 ppm. API tests are fine as long as you are aware of their limitations. I think the Red Sea nitrate test is better at the lower end of the range while API has about a 5 ppm detection limit. I use API tests with other tests as a confirm. But all of the home tests have limits.