Ok so I know this probably is nothing to be worried about but I just want to check. Cycled my tank have had some more fish in there for about a week now. did a 20% water change monday with a reading of 0 0 5 (with api master test kit). Today checked again and had a reading of .5 0 5 or 10 orange was kind of inbetween. Should I do another water change? Is it ok that I am getting a small amount of ammonia?