I am trying to fix up a fish tank I kind of didnt take the greatest care of Ive just kept a few fish including some guppies, mollies, platies and corydoras in a 60 gallon and all of them have lived for almost a year or more now in these conditions however I decidied to measure water parameters using APIís freshwater master kit and got .25-.5ish ppm
of Ammonia, and 0 ppm
for nitrites and nitrates. I did two tests to make sure this was accurate. This is very odd to me because I have ran this tank for over 3 years now and the only explanation I knew of for these readings would be an uncycled tank. It doesnt really make sense for it not to be cycled but rather inaccurate readings or something I am doing that kills the beneficial bacteria possibly every water change or maybe just a source im not cleaning enough these are guesses.Could my tank possibly still not be cycled or is there another more likely explanation?