I have a 40 gallon freshwater tank I am trying to cycle using Seachem Prime and Stability. This is a fish-in cycle with 4 guppies. I have followed the directions on the bottles (Prime every other day and Stability every day for 7 days), but after 8 days I have still never seen any traces of ammonia, nitrites or nitrates. I am using the API master test kit. How is there no ammonia building up if there are fish in the tank? I am very confused by this.