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- - testing after water change (http://www.tropicalfishkeeping.com/beginner-freshwater-aquarium/testing-after-water-change-5628/)
testing after water change
how long after i do a water change do i need to wait to test the water again for nitrates and nitrites
2-3 hours is plenty or even an 1 hour
I used to test about 15 minutes after the change and I saw a different reading. It shouldn't really matter as long as the water is being circulated. If the bacteria are out they are out.
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