Ammonia and Nitrate

When these two factors get too high, they can harm and kill fish. Ammonia is produced when fish pee and nitrate is produced from the waste of the bacteria that eat the ammonia. In order to test for these you have to get a sample of your tank water, put the right amount of drops from the bottle for each type of test and wait to compare it to a chart. The lower the better when it comes to these tests.