I am new to aquariums I have had my 50 gallon tank set up for 10 weeks and it is cycled just fine. But I have done a ton of research and the biggest mistake people make , as I did , is thinking that the ammonia reading they get from a test kit is the real toxic ammonia. It is reading both the NH3 and the NH4 free ammonia is the nh3 and that is what is toxic. You can get a test kit from seachem that measures them seperatly or you can get a chart called Un-ionized ammonia ( nh3) factor chart. You measure you ph and then measure your ammonia with a standard kit then look on the chart for your ph combined with your water temp and that will give you the actual ammonia reading. For example my ammonia measured about 1.0 ppm my ph is 7.2 and my temp is 80. When I multiply my ppm by the factor on the chart I actually get a true reading of about.006 ammonia ppm....Hope that helps and -please pass the info on to others.....