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pH Question
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jersysman
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Joined: 16 Mar 2005
Location: Galesburg, Illinois

PostPosted: 2005.04.10(Sun)13:46    Post subject: pH Question Reply with quote

I am in the process of cycling a 20 gallon tank. It has been 6 days now and the ammonia is at 8 ppm. My question is about pH though. I tested the pH in the aquarium and it registered 8.0. I then tested the pH of my tap water and it was 7.4. Does the cycling process raise the pH of the water? I want to have some rainbows in my tank and a pH reading of 8.0 is too high for them, while the 7.4 would be okay. Should I expect a drop in pH after the tank is cycled?
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benedictj
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Joined: 05 Dec 2004
Location: new york, ny

PostPosted: 2005.04.11(Mon)11:56    Post subject: Reply with quote

You might want to take a look at what you have in the tank. Some rocks and gravel will leach carbonates into the water, which will raise your pH. Typically, cycling actually causes pH to fall, so it would definitely be a great idea to investigate what might be causing the pH to rise.

What type of rocks, gravel, decorations do you have?
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Robert 1
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Joined: 12 Apr 2005
Location: Thezan les Beziers, Southern France

PostPosted: 2005.04.12(Tue)1:00    Post subject: Reply with quote

Laughing My new tank water has settled at N& 3 = 5.
N& 2 = 0. GH 16. KH 0. and pH 7.6. I transfered two fish from my old tank with most of the old tanks water on April 7 and all seems well, I am thinking of adding a couple of more fish this week. Is the water OK at this level.
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jersysman
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Joined: 16 Mar 2005
Location: Galesburg, Illinois

PostPosted: 2005.04.23(Sat)22:52    Post subject: Reply with quote

I have another observation. I hope someone can shed some light on it for me. I tested the water straight out of the tap. It had a pH reading of 7.2. I let it sit out in a bowl for 48 hours and took another test. This test read 8.0. Why would the pH go up from 7.2 to 8.0?
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benedictj
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Joined: 05 Dec 2004
Location: new york, ny

PostPosted: 2005.04.24(Sun)6:28    Post subject: Reply with quote

Jerseyman- That is actually a pretty common occurence. When water gets pumped to your tap, it is typically pressurized with air which becomes disolved in the water. After letting the water sit overnight, that gas slowly expels from the water, causing the pH to change.

Robert 1- That water is fine for some fish, it really depends on what you have. You might want to look at your KH kit (check the expiration date, look into the effectiveness of the kit you have- what kind is it?). It is pretty uncommon for water to have such a high GH without any KH at all.

Hope that helps guys.
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jersysman
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Joined: 16 Mar 2005
Location: Galesburg, Illinois

PostPosted: 2005.04.24(Sun)11:36    Post subject: Reply with quote

Could using an RO system keep the pH down or lower the pH of tap water in general?
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benedictj
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Joined: 05 Dec 2004
Location: new york, ny

PostPosted: 2005.04.24(Sun)13:53    Post subject: Reply with quote

Yep, using RO water will bring down your pH, since it is virtually devoid of hardness.
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jersysman
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Joined: 16 Mar 2005
Location: Galesburg, Illinois

PostPosted: 2005.04.24(Sun)15:25    Post subject: Reply with quote

benedictj wrote:
Yep, using RO water will bring down your pH, since it is virtually devoid of hardness.


I think I will get a small one. I will start with a 50/50 ratio and experiment from there. Thanks for the help.
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