I added pure ammonia to my 100 gallon tank a few days ago and have been maintaining an ammonia level of 4 to 5 ppm. I tested my tank for nitrites and got a reading of 5.0... Is this the n20 spike? My current level of ammonia is down to 3ppm... What do I do next? Do I continue to add ammonia or do I do the water change... This is my first time cycling a tank.. Thanks :help: