What PH should I set my controller at - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 09-12-2013, 02:53 AM Thread Starter
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What PH should I set my controller at

Well in going high tech the PH controller I got was a dud, so I got an awesome deal on here (thanks you know who you are) on a new one. The guy told me whom I bought the original one with that the probe didn't work, in reality it was the controller that didn't work.

So Where should I be setting this monster to control my CO2? I checked the probe that that I got and it seems to be registering about 6.5 right now in the water with the globe showing that the CO2 is green.

This is for my 55G listed in my journal below

Basic specs:
T5HO dual 48" bulb (coralife if it makes a difference)
Probe is in line at the CO2 reactor in my canister setup
Going with a 4h on, 4h off, 4h on, 12h off schedule (seems to have been working so far for lights)

Thanks and feel free to ask any questions about my setup to help me get this running, I've been doing the "I'll turn it on in the AM thing with my electronic bubblecounter and well let's just say that apparently my memory isn't too reliable about getting it going half the mornings and it's leading to issues that constant co2 will alleviate
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post #2 of 6 (permalink) Old 09-12-2013, 06:18 PM
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What's the pH of the water without any CO2 running? I would go to 1 whole point below that.

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It's CO2. See-Oh-Two. Not C02 (see-zero-two).
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post #3 of 6 (permalink) Old 09-13-2013, 02:08 AM
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Assuming your water isn't soft you will want a ph to be no higher than 7. 6.6-6.9 is a good range. Peruse the web for more details why this is so. The answers are easy to find.
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post #4 of 6 (permalink) Old 09-13-2013, 01:30 PM
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Quote:
Originally Posted by Steve001 View Post
Assuming your water isn't soft you will want a ph to be no higher than 7. 6.6-6.9 is a good range. Peruse the web for more details why this is so. The answers are easy to find.
If his water is running a standing pH of 8.4, bringing it down to 6.9 with CO2 will kill any inhabitants in the tank due to CO2 poisoning.

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post #5 of 6 (permalink) Old 09-13-2013, 03:19 PM
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What's your kh and ph with and without co2 / lights?

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Last edited by exv152; 09-13-2013 at 05:31 PM. Reason: .
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post #6 of 6 (permalink) Old 09-13-2013, 05:13 PM
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It depends on your kh. If your kh is around 3 to 4, a ph 6.4 or even lower would put your CO2 level between 35ppm to 45ppm. Look at Tom's chart here:

http://www.barrreport.com/showthread...O2-pH-KH-table


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