ph, gh, & kh different in all three tanks - The Planted Tank Forum
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post #1 of 3 (permalink) Old 06-05-2014, 01:45 PM Thread Starter
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ph, gh, & kh different in all three tanks

so here's a little background on my three tanks and my tap water:

tap: 8.0ph, 4gh, 4kh
29g: 8.0ph, 8gh, 4kh (Flourite Black topped w/Flourite Black Sand)
10g: 7.8ph, 7gh, 6kh (Flourite Black)
10g: 7.6ph, 6gh, 7kh (Eco Complete Black)

All tanks have driftwood and are dosed with Flourish, Excel, Pottasium, & Iron.

The 29g is home to 8 Emperor Tetra, 12 Cardinal Tetra, and 2 Nerite Snails. The 10g aquariums are going through a fishless cycle right now.

So... all of that being said. 1) why are the gh and kh (in most cases) higher than the tap water? 2) what could be causing this? 3) are these levels ok, or should i be doing something to adjust them?

The 2 10g aquariums are going to house Betta.

Thanks in advance for any tips or advice you might have. There's so much to learn about aquarium and fish care. I feel like my mind is about to explode. Hehe.

Last edited by bcarrot; 06-05-2014 at 02:00 PM. Reason: spelling mistake
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post #2 of 3 (permalink) Old 06-05-2014, 03:37 PM
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All of those parameters are ok. You don't need an exact value for GH, KH, pH, or anything else in order for fish and plants to do ok. They all adapt to the water you have. Water companies add chemicals to their water to keep the pH above 7 to avoid eroding pipes, but those chemicals dissipate when the water sits for some time, letting the pH drop back to a more normal reading. (8 is high)

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post #3 of 3 (permalink) Old 06-05-2014, 03:43 PM Thread Starter
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thanks for the reply. it's good to know that my water is ok. phew. i know some people think "they're just fish" but I take fish keeping very seriuosly and I want to do what I can to keep them happy.

would it be wise to fill a bucket of water, add declorinator, and let it sit for a day or two before it put it in the tank prior to doing my partial water changes? (i would heat the water back up to tank temp of course) i don't want to shock my poor fish with water that has a higher ph thank in the tank.
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