Moving fish - different pH - The Planted Tank Forum
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post #1 of 4 (permalink) Old 06-22-2008, 10:50 PM Thread Starter
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Moving fish - different pH

I will be ready to move some fish into their newly setup tank soon, but here's my problem. Their current holding tank has a pH of ~7.6, the new tank has a pH of ~6. I'm afraid the move to a much lower pH will be a shock and cause some unnecessary fish loss. What is the safest way to accomplish this?
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post #2 of 4 (permalink) Old 06-22-2008, 10:57 PM
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could you do the drip accumulation?
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post #3 of 4 (permalink) Old 06-23-2008, 04:23 AM
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I acclimate my fish with water changes over a few days, about .5 pH per day.

I put the fish in a small tank (2.5gal) with water from their own tank, and do partial water changes daily with water from the destination tank, being sure not to change the pH more than .5. If I'm unsure how much new water to add (sometimes it's heavily buffered and a little can make a big change) I just add a little bit like 5% or 10% and check the pH after 10 min or so.

That's just my method, and I've never noticed a fish being very stressed about it. It may be overly cautious but I really don't know how much pH can fluctuate in the wild after a rain or whatever.
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post #4 of 4 (permalink) Old 06-24-2008, 10:04 AM
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I thought I'd toss this in....

I usually keep my tanks around 6.7 pH, and when I do my weekly water change the pH jumps up to 7.4 because the new water doesn't have any CO2 in it. This change happens relatively fast, over the course of 3 minutes. In the beginning, I was overly worried that the shift in pH was going to stress the fish. Several years later, the same fish are still going strong and are healthy as ever. (Tiger barbs, zebra danios, galaxy rasboras, shrimp, etc. nothing exotic.)

I was a little more relaxed about this when I read that fish are more sensitive to changes in pH when that change in pH is caused by changing the KH quickly and drastically. But if the KH remains close to the same and the pH change is caused by acids (like adding CO2), then the effect on the fish is not that much of a problem.

I wish I could find where I read that.... So I don't know how accurate my comment is.


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