"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.