Re: adjusting pH of aquarium water

"Robert Flory" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>...
> "Paul Wright" <[EMAIL PROTECTED]> wrote in message
> news:[EMAIL PROTECTED]
> > Hello all,
> >
> > I was wondering...why is sulfuric acid often used to lower the pH of
> > aquarium water? I thought that it would be more toxic than using something
> > like hydrochloric acid. Do the SO4 ions serve a purpose in the tank?
>  Please
> > let me know. Also, does anyone know the concentration of sulfuric acid in
> > commercial home aquarium pH adjustor kits? There's a warning, alerting me
>  to
> > the precense of sulfuric acid and warning me of it's corrosive properties,
> > but no mention as to how concentrated it is.
> >
> > Many thanks in advance for your help!
> >
> > Paul
> >
> Most fish are more sensitive to chlorine than to SO4.

Using HCl would introduce chloride ions, not dissolved chlorine gas.