New DIY CO2, rapid decline in pH - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 11-21-2011, 05:57 AM Thread Starter
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New DIY CO2, rapid decline in pH

My DIY CO2 has been running for 4 days now. 10g w/ 2 java fern, 2 anubias and an unknown bulb plant.
My tap water is alakline and for the life of the tank it's always run at ~7.6. I understand the chemistry which is driving the pH down, but is this decline too rapid?
My numbers pH/KH/GH
day 1 7.6/4/8
day 2 7.2/5/9
day 3 7.0/5/9
day 4 6.6/5/10

I'm guessing my KH is borderline and not buffering the H+ production from the added CO2. Should I titrate in some NaHCO3?

Re: the GH the day after I started the CO2 I noticed and Ich problem, I believe from some recently added nerite snails (only addition to the tank that correlated). I have been using higher temps and aquarium salt, which I'm guessing raised the GH.

Other livestock 2 platy 2 honey gourami 3 cardinal tetra 1 gold algae eater 1 common goldfish

Thanks all
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post #2 of 9 (permalink) Old 11-21-2011, 07:58 AM
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Its a fairly slow decrease, so I wouldn't be too worried about it affecting your livestock, if it starts getting below 6 then it may become a problem. Is the co2 going during the night? as this is when it will build up as the plants aren't using it.

And aquarium salt will definately cause a rise in gh
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post #3 of 9 (permalink) Old 11-21-2011, 10:18 PM Thread Starter
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Yes it's yeast CO2 and it runs 24/7. I guess I could place some sort of pressure relief valve to turn it off to the tank overnight.

So this is a slow decrease?
And add bicarb if it drops below 6? Down that low seems to be the low pH level recommended for my fish
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post #4 of 9 (permalink) Old 11-21-2011, 10:36 PM
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I stopped worrying about pH after I started using CO2. Several people told me that pH drops caused by CO2 really don't matter. I don't understand why but my fish are still fine.

Easiest way for me to deal with it was to just stop monitoring pH. lol

You'll find that your DIY CO2 will increase, level off and then decline each time you start a new bottle.
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post #5 of 9 (permalink) Old 11-22-2011, 01:56 AM
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Honestly I think running it all night is your best bet... keeping it low and stable is better than having fluctuations. If they're hanging around the surface gasping in the mornings, try running an airstone at night for better surface gas exchange. It would be kind of hard to gas your fish out with DIY unless you added like 3 tablespoons of yeast.

I have DIY CO2 running 24/7 as well, and it drops my pH from 8.2 to 7.6. My fish have never been better. :P
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post #6 of 9 (permalink) Old 11-22-2011, 03:44 AM
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Is fine. My ph swing is from 6.2 (during the day with CO2) to 7.2 at night (CO2 off) in one day. Ph swing from CO2 won't do harm to your fish. At night, you can add an air stone in the tank to gas off the CO2. Don't add any sort of pressure release valve. Whatever container you use for the yeast, the pressure would get too great. It may even explode if the CO2 has no way to go when you put a valve onto the CO2 line.
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post #7 of 9 (permalink) Old 11-22-2011, 04:17 AM
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CO2 is a slight acid so it does affect the pH but it does not alter your GH. So, the fishes don't care.


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post #8 of 9 (permalink) Old 11-22-2011, 04:52 AM
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What are you using to mix the CO2 into the water column? If you are using a powerhead reactor of some sort, you can just plug the powerhead into the same timer as your lights.

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post #9 of 9 (permalink) Old 11-22-2011, 06:05 AM Thread Starter
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Quote:
Originally Posted by galabar View Post
What are you using to mix the CO2 into the water column? If you are using a powerhead reactor of some sort, you can just plug the powerhead into the same timer as your lights.
Great idea
I have a DIY reactor w/ a powerhead
the CO2 will eventually fill the chamber and bubble through the filter out the bottom
less dissolved co2 overnight vs daytime
runs the risk of some fluctuation but not as much as completely on/off

thanks all
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