Fish tank wont start to cycle!?

my fish tank has been running *with three fish in it* for like two or three weeks now. ammonia is at 2.0 ppm nitrite is at 0 ppm and nitrate is at 0 ppm. (this is right after a 25% water change). am i doing something wrong? its a 55gallon tank.
i said my fish tank.. not my fish.. im guessing u dont know much about fish tanks? plz dont answer then :(
it hasn't even started to change with nitrites and nitrates. which i thought its supposed to go from one to the next to the next. :/
oh. and i have two oscars and a catfish :) lol just if u needed/wanted to know
 
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