API GH and KH test results... what does it mean? - The Planted Tank Forum
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post #1 of 3 (permalink) Old 08-10-2009, 07:18 PM Thread Starter
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API GH and KH test results... what does it mean?

Ok so I tested my tap water and these were the results:

GH=4 drops

KH=6 drops

PH was around 7.4

Are these acceptable levels?

Thanks Josh
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post #2 of 3 (permalink) Old 08-10-2009, 08:22 PM
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GH = 4 drops means your water is soft, not so much calcium and magnesium
KH = 6 drops means your carbonate hardness or buffering capacity is a bit higher
PH = 7.4 is related to KH meaning buffering capacity raises PH or alkalinity.

Lower GH is good for fish that live in the Amazon, Rio Negro, Orinoco etc. Examples being Cardinal Tetras, German Blue Rams, Discus etc.

KH being higher means your PH will tend to stay constant.

If nitrates and phosphates aren't to high, it looks like you have good water for Planted Tanks.
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post #3 of 3 (permalink) Old 08-17-2009, 06:27 PM
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Your kit comes with a pamphlet that tells you the hardness based on your results and even lists the fish that prefer that hardness. The number of drops equals the degrees. So 4 drops is 4dGH or "general hardness".

The "ideal" settings may depend on the type of fish you want to keep. For instance I have a Discus/amazon tank. I keep my kH and GH around 3-4 and my pH around 6.3-6.8.
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