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I have let the pH go from 6.8 to 7.8 when CO2 ran out or was otherwise shut
off numerous times with no apparent harm to fish (tetras, barbs, cats, otos,
danios). If it stressed them they didn't show it.
> From: Neil Frank <aquarian.subjects at mindspring_com>
> Date: Fri, 11 Jan 2002 06:50:52 -0500
> Subject: Re: CO2
> HERE IS A RELATED QUESTION for everyone. When the CO2 tank stops (say, when
> the tank is finished), the pH will go back from where it came. So pH 7.0
> jumps back to 8.0 and fairly quickly. Not too bad for the plants (except
> some like Bolbitus which thrive on CO2 and turn black and hard and even
> crusty (biogenic decalcification) when they try to get their carbon from
> bicarbinates (this has happened to me, and was the way that I finally
> noticed that my CO2 tank was finished), but HOW DOES THE RAPID JUMP IN pH
> (and return to higher pH) AFFECT SOME FISH.