I started using Prime water conditioner for my new betta fish because my tap water has some ammonia. I mix the tap water with Prime and leave it to sit for 24 hours then I use it. Yesterday I tested my fish tank water and my "sitting" water for nitrites. Water from tank was showing 0 nitrites, the water mixed with Prime the day before and that was sitting for 24 hours was showing 1.5ppm. I couldn't believe that. Is this a false reading or what? I tested my fresh tap water and it has no nitrites. I use an API test kit. Has anybody tested the water after adding Prime and got the same reading?