Thats cuzz it'll never go to 4ppm again. You mis understood, or were told by a doink. You add FIVE ppm (four works fine too though) of ammonia the first day, measure how much it took to make 5ppm (so say 1tsp for example though its likely to be much lower) then add the identical amount DAILY. you dont ever get the 5ppm again. if you could it'd mean your ammonia oxydizing bacteria wasnt colonizing. this should be bloody common sense. Do you add exponentially more fish every day? No. Think about it.
Also, no offense to the guy I just quoted here- but IGNORE HIM HE DOESNT KNOW WHAT HES TALKING ABOUT and the way he's explained it will confuse you more. Dump ALL your water out. This will not hurt your biofilter. Fill it with all new water, try to remember how much ammonia you added the FIRST day, and keep adding ONLY THAT AMOUNT daily until you cycle. I know what Im talking about. Trust me. Or you can not trust me and not solve your problem
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