Ive got a 10 gal tank that has been running for quite some time now with little to no issues. According to water tests it seems to be cycled. I normally get .25ppm for ammonia but that seems to be where my kit zeros out, 0 nitrite, and about 20ppm nitrate. I still run water tests quite regularly to make sure everything is all good. On occasion I get a reading for ammonia of .5, which in actuality is .25, 0 for nitrite and still around 20 for nitrate. Is it normal to get a reading for ammonia? or is there something off with my cycle?