I question the kit. Test with a calibrated hannah or pinpoint. I think your chasing it to hard. ANY TIME ya get a new kit for any of the tests it's good to double check the same water,,,IE Glass jar, same batch, for an average. Get what you can into anothers tank, frag some still living to a couple of different members to at least keep the stock going till all is settled down. Good Luck. Keep us updated.