Minimizing fish stress from pH shift after water change - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 06-24-2008, 09:53 PM Thread Starter
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Minimizing fish stress from pH shift after water change

So...my tap water's pH is usually around 7; my tank's pH likes to level out around 5.6 after CO2 is injected. After a 50% water change, I notice the pH increases to near 6.76 or so. It takes only a few hours for the pH to return to normal. I have no animal life in the tank (at least none that I care about - see the words beneath my user name), but I'm concerned that when I do have things that I don't want to kill in the tank such a drastic shift in pH will have negative consequences on their overall health, or at least their happiness. Am I over-thinking the potential consequences of pH shifts, here?
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post #2 of 5 (permalink) Old 06-24-2008, 11:25 PM
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try leaving your conditioned replacement water out for a day before you do your water change or add a PH adjuster (i.e., seachem's discus buffer) to bring the water down to 5.8 before adding to the tank.....
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post #3 of 5 (permalink) Old 07-07-2008, 02:23 PM Thread Starter
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bump?
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post #4 of 5 (permalink) Old 07-07-2008, 03:54 PM
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Not sure what your WC process is, but the bulk of the pH swing is because of C02--so, as in the other thread--don't worry about it.

If your tank water comes from your tap--then it should have about the same TDS or higher. It is much easier on fish to go from higher TDS to lower, than it is the other way around.

As for the C02--the WC water (tap/RO/etc) contains much less C02 than what's in the tank--so, you can naturally expect the pH to rise until the C02 system has a chance to reload the system with C02. Also, for someone using a bucket or some other method that outgasses some of the C02--its going to create a higher pH swing and take the C02 system longer to get the right amount of C02 built back up.


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post #5 of 5 (permalink) Old 07-07-2008, 04:11 PM Thread Starter
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Thanks for that, Naja. Right after I bumped this thread (I think I waited long enough) I read discus' response in the other thread (drop checker color thing) and was like - ooops, guess I didn't need to bump this after all...But I appreciate the response nonetheless.
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