USCG CWO
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I had a batch of Co Op test strips that wouldn't change color either. Like NO color change at all. I know the tank had ammonia as it had been running for about 3 weeks. I also used a competitors test to confirm when I couldn't get any color change. I contacted the Co Op and they are sending me a new batch of test strips. I'll try the new ones and see if they work. Maybe a bad batch???