Ph levels.
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Ph levels.

This is a discussion on Ph levels. within the Beginner Freshwater Aquarium forums, part of the Freshwater Fish and Aquariums category; --> I have recently set up a 36 gallon tank, about three weeks into the cycle. I have been monitoring the ph levels and they ...

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Old 01-18-2012, 06:47 PM   #1
 
Ph levels.

I have recently set up a 36 gallon tank, about three weeks into the cycle. I have been monitoring the ph levels and they are high. Is this a cause for concern and what are the best ways to get it down. I am not sure y it is high and hope it is not harming my fish.
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Old 01-18-2012, 07:26 PM   #2
 
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We need more data to answer your question.

What is the pH of your tap water (assuming that is the source water)?
What is the pH of the tank water (which may be different)?
What pH do you want in the tank, related to what fish species are you intending?

It would also help to know the GH (general hardness) and KH (Alkalinity) of your tap water, as these are related to pH and we can better advise on the pH if we know what to expect because the pH in an aquarium will react subject to the hardness. You can find this out from your water supply people; no need at this stage to get a hardness test kit, yoyu may not need it again.

Byron.
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Old 01-18-2012, 07:38 PM   #3
 
Wow, lots of info to obtain. I have a ph tester but it does not go higher than 7.6 and that is what it is reading. The other info I would have to research.
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Old 01-18-2012, 07:49 PM   #4
 
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Quote:
Originally Posted by Mgreen View Post
Wow, lots of info to obtain. I have a ph tester but it does not go higher than 7.6 and that is what it is reading. The other info I would have to research.
Is the tap and tank both 7.6 then? When testing tap water, let a glass sit overnight. But I would find out from the water folks what they say the normal pH is, just as a check in case it is higher than your test kit. And they can tell you the hardness. They may have a website. And don't forget about the fish you want so we know the optimum pH.
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Old 01-19-2012, 06:56 PM   #5
 
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When testing tap water, let a glass sit overnight.
I've never heard that before...could you please explain the reason to let it sit?
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Old 01-20-2012, 03:18 PM   #6
 
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Quote:
Originally Posted by faronem View Post
I've never heard that before...could you please explain the reason to let it sit?
Tap water may (and usually does) contain dissolved CO2, and that acidifies water so it lowers the pH. You often see this during a water change, all the bubbles from the influx of fresh tap water. Allowing a glass of water to sit overnight allows the CO2 to dissipate, and the pH reading may then be higher than it would straight out of the tap.

It depends upon the CO2 level in different water supplies; mine is negligible, I get 7 or 7.2 whichever way; but some people will see a difference of a couple decimal points. The higher reading after CO2 has gassed out is the true pH of the water.
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