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Nitrates and water changes

This is a discussion on Nitrates and water changes within the Beginner Freshwater Aquarium forums, part of the Freshwater Fish and Aquariums category; --> Originally Posted by corina savin Ok, I just tested the waters. I use API test for KH/GH and nitrates and Hagen for pH (2 ...

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Nitrates and water changes
Old 01-21-2013, 06:43 PM   #11
 
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Quote:
Originally Posted by corina savin View Post
Ok, I just tested the waters. I use API test for KH/GH and nitrates and Hagen for pH (2 separate solution, one for low range and one for high range)
Tap water (aged for 3 days): pH 8, KH 6 drops, GH 9 drops
Tank water: pH 7.4, KH 3 drops, GH 7 drops

Just for fun I checked pH of the filtered trough peat water and was crazy 6 (I only passed one cup of water, hopefully is not that acid when I pour gallons at a time).

Why am I boosting the KH? I don't know. I notice that it disappear over time, I have no idea why. But it's true...Tap water has carbonates/bicarbonates, I add some and its still lower than tap. For the GH I must admit that I use some RO water in my mix....or to replace the evaporated part.
The RO water mixed in will lower GH, KH and pH. So that explains why the tank's numbers are lower. No problem there.

Please don't mess with the KH. KH has absolutely no impact on fish or plants, but it is part of the GH and pH relationship and as a buffer it can do weird things to the pH. It is always best to leave it alone unless it is absolutely essential to raise or lower the GH/pH for the fish species. That is a different issue.

And the tank values are ideal for raising angelfish fry.

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