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+1 this!snazy said:See, the problem with tests is that you rely on them for your water change. You shouldn't. You should observe your fish. Most of the tests, whether liquid or not are inaccurate. The liquid tests might be good enough to detect there's something toxic, but not good enough to tell you whether it's a safe level. Also, there's no safe level for ammonia or nitrIte, besides 0. The nitrAte test is totally inaccurate.
In your case you get a reading of both ammonia and ntirIte. You had a dead fish too. You didn't need tests to tell you the water isn't ok.
50% water change once in a while is not good enough. You need to do these daily, if not twice a day to keep the levels as close to 0 as possible, otherwise you won't get much surviving fish.
how does one "keep the levels as close to 0 as possible" if you don't measure it with a test?