so i had my tank with a piece of shrimp in there for cycling it. i kept it in there for a little over a week and took it out. then i did water changes til the ammonia came down. i tested it and all i saw was 0 ammonia and 0 nitrites all the time but nitrates were like 80 ppm and after the water changes i got that number down to 20 or so. so ive been testing my water every other day about and ammonia/nitrites are at zero and nitrates at like 20 and ph at near 8 i guess. just wondering if my tank is cycled. how will i know if it's not cycled? my fish seems to be doing great in it, he swims around like crazy.