is my tank really done cycling?

i just got a new 55gal 3 days ago. i put in an old filter from my 24gal thats i think is cycled. (its still having ammonia nitrate and nitrite problems ) anyway i let the tank run for two days then i added 2 oscars to the tank. it has been 24hrs and the oscars are showing no signs of stress at all, but my ammonia in the tank is .5ppm, nitrites 0 and nitrates are a bit under 1.0ppm. i am using test strips. my 24gal has been set up for 5 weeks now and i just started adding fish to it 2 weeks ago. so far it has a clown loach, 2 tetras, 3 barbs, peacock eel, and brown knife fish. i do know it is overstocked but i hope to put the eel and brow knife in when they grow bigger (they are small right now 5-7inches). so my question is: is it okay for my oscars to be living in this tank? and how long will it take untill my levles go down to 0?


input will be greatly appreciated!, thanks!

what should i do with the all the fish i have then?

WAY TO GO PETSMART!..god i wouldent have added these fish if id had known this

im so mad/sad/depressed..all this hard work on my tank for nothing. now i will have to wait like 3 months untill i can get fish

its just a regular filter..it came from my tank i thought was done cycling (petsmart told me it was) but come to find out im not sure now because my nitrates are 0 nitrites .5 and ammonia 1.0ppm