let me restate...most fresh freshwater fish seem to be more sensitive to
chlorine compounds that sulfate compounds.

Bob
"David Lloyd" wrote in message
om...
"Robert Flory" wrote in message
...
"Paul Wright" wrote in message
hlink.net...
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.