I have the API test kit and I have really inconsistent ammonia test results. The photo shows three tests, the first two from my aquarium and the third from rodi water. I expected a false positive but this is ridiculous! I know they darken with time so I took the photo a half an hour after the test. My fish all appear happy and healthy so Im assuming that the ammonia cant be that high. My other parameters are all good. Is it the test or the water? If its the test, what brand would be better?