PH fluctuation from CO2? - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 07-24-2013, 09:51 PM Thread Starter
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PH fluctuation from CO2?

I know that PH fluctuation is bad for fish and inverts, and mine is usually stable as is, BUT... My CO2 drops my PH from ~7.4 to ~6.2-ish every day -- is this stressing my fish, or is that an acceptable range to slowly and regularly shift between throughout the 8 hour photoperiod and however long it takes to return overnight?
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post #2 of 9 (permalink) Old 07-24-2013, 09:54 PM
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That much fluctuation is BEYOND acceptable for even most super hardy fish. I suggest buffering your water naturally using things like pool filter sand, crushed coral, and others. That should solve it 95%.
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post #3 of 9 (permalink) Old 07-24-2013, 09:56 PM
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It's totally fine.

When carbonic acid is formed (resulting in the pH swing), hardness is not impacted, so it will not be an issue for most critters you can keep.

Do not attempt to alter your water parameters as suggested above.


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post #4 of 9 (permalink) Old 07-24-2013, 10:47 PM
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In 2 hours, my pH goes from 7.3 to 6.0 and nothings dead yet. I have a ph co2 controller and it turns on 2 hours before lights go on. Its not problem.

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post #5 of 9 (permalink) Old 07-24-2013, 11:15 PM
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1.0 to 1.4 pH drops for the last 15 years.

Oddly, I've bred about 30 fish species somehow, grown more plants than I can recall, and never have had any pH related issue. Must be dumb luck eh?

CO2 is NOT a salt, so there's a HUGE difference between pH change due to salts, like say baking soda, vs say CO2.

Old advice specific to those NOT using CO2 gas for plants.
Once you add CO2, the pH thing goes out the window. Hopefully in the trash with the other myths.




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post #6 of 9 (permalink) Old 07-25-2013, 12:05 AM
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What Tom Barr says is probably correct at all times. I would guess that stress in your fish is more likely due to lack of circulation, rather than CO2 levels or pH swings.
Good luck,
Dave
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post #7 of 9 (permalink) Old 07-25-2013, 12:52 AM
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Many many years ago the only test the old aquarium keepers has was pH.

When something happened to the water to change the pH and fish died, they blamed pH and got the myth started that fish cannot tolerate fluctuating pH.

Many things can alter the pH, and the fish may react to these other things, not to the pH change itself.

When the pH changes due to CO2 the fish do not mind at all.

When the mineral or salt levels change this is very important to the fish. If those changing mineral or salt levels alter the pH, then the fish may have problems, but it is not the pH. It is the minerals.

Measure the TDS and keep that stable.

The pH ought to be in the right range for the fish, but it can fluctuate all over that range, and it is not a problem. As long as the salts and minerals (TDS) are stable.
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post #8 of 9 (permalink) Old 07-25-2013, 02:02 AM
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What on earth about the PH. Who told you that lol?

I'm not into the image, but into the hobby...
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post #9 of 9 (permalink) Old 07-25-2013, 04:17 PM Thread Starter
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Great info guys, thanks a ton. I actually ordered a TDS meter last night, along with a copper kit just to see if there's any in there from long, long ago treatments and to see if I've got anything coming in from the tap. Slowly narrowing down the variables negatively affecting my tank, curious to see what TDS meter will reveal (I know there is much debate about and many variables affecting TDS; will be my next learning endeavour). Thanks again guys.
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