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Good evening Nerms.


I just found a weird situation. I did not test every tank but in the few I checked I got high - over 1000 ppm TDS.. no, not my tap water. It checked average 25. So, on two tanks I checked all parameters which were within normal, low ranges except GH which was off the chart.  Tap water normal. 

What is causing this? Fish seem fine. Plants seem fine. Low pH. 6.0 - 6.5.


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Thank you! I will give it a go. 

I was ready to blame the instrument, my API test kit, etc but after numerous tests, it points to some sort of tank syndrome. I'm going to test more of my tanks in am and try to sort out a pattern.


I appreciate your input!

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