Could be as you said but I continued with a 30% WC even after this test. Will update another test result in a couple of days. I want to reach a point where I could skip wc and the bb can handle the ammonia, I am pretty sure am not there yet.Take a closer look at the testresults again. I wanna say that ammonia is 0.25 not 0. Its a grenish yellow not all yellow in the test tube.