Josh W Posted January 9, 2021 Share Posted January 9, 2021 I've had a 120L tank cycling for about a week and a half (fishless). It's had trace amounts of ammonia / nitrite / nitrates as would be expected. Then suddenly this morning when I checked the water with a Tetra test strip I had a very high chlorine reading out of nowhere. I haven't done a water change in a week and there's been nothing new added into the tank. Any ideas where this might have come from? I've tested multiple different strips with the same result, tested other tanks (which displayed no issues), then used Prime to knock the chlorine down and watched it vanish from the test... so I believe the readings are correct. Has anyone had experience with chlorine showing up mysteriously this way? Link to comment Share on other sites More sharing options...
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