Re: water changes and bubbles.....

["Zsolt Fazekas" <fazekaszs@hotmail.com>]

The partial water change (one-third or one-fourth) with tapwater of a well 
established aquarium in this respect doesn't cause such deseases. The 
problem arises, I think, when you fill up a new tank completely with 
tapwater - old water is not present at all -, and put the fish directly 
-without waiting - into it. The gillcovers of the fish starts to move fast 
as if the fish didn't have enough oxigen in the water, but it is not the 
case in this situation: It is because the water is oversaturated with gases 
and/or the PH is different, and the fish reacts in this way.

Zsolt Fazekas


> From: "Max Gallade" <mgallade@hotmail.com>
> Reply-To: apisto@listbox.com
> To: apisto@listbox.com
> Subject: Re: water changes and bubbles.....
> Date: Tue, 19 Jun 2001 13:42:42 -0000
>
> This is one of the reasons why I age,heat and condition my tapwater before
> adding it to my tanks.I have a Rubbermaid trashcan that I fill with
> tapwater.I constantly run a powerfilter(filled with peat)  and a heater in
> the trashcan.The water is fine to use after a day or two and all the gases
> should be dissolved.
> Just my two cents.
> Max
>
> > From: "Zsolt Fazekas" <fazekaszs@hotmail.com>
> > Reply-To: apisto@listbox.com
> > To: apisto@listbox.com
> > Subject: Re: water changes and bubbles.....
> > Date: Tue, 19 Jun 2001 07:41:08
> >
> > It is because the water is under high pressure in the system of the water
> > supply, and under such a pressure the gases  (nitrogen, oxigen,
> > carbon-dioxid, and so on) are fully dissolved in the water. When the water
> > flows out of the system (tapwater) the pressure suddenly drops at the
> > outlet
> > and the equilibrium between pressure, temperature and ammount of dissolved
> > gases are upset. Then the tapwater becomes "overdissolved" in gases at a
> > lower pressure, and starts to release the gasses, creating tiny bubbles,
> > soon until the equilibrium builds up again, depending on the now lower
> > pressure and the surrounding temperature.
> >
> > The lower the pressure is and the higher the temperature is of the 
> > tapwater
> > at the outlet, the more gasses are released.
> >
> > I read somewhere that the overdissolved gases can cause diseases similar 
> > to
> > the divers (tiny gas bubbles appear in the tails).
> >
> > Zsolt Fazekas
> >
> >
> >
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