What about using Baking soda; (sodium bicarbonate or sodium hydrogen carbonate) to dechlorinate?
NaHCO3,
Chlorine = Cl
Products of reaction
Salt = NaCl
Water = H2O
Carbon-Dioxide = CO2
I do this in my dishwasher, run with bleach to clean & disinfect, then run with baking soda to remove the chlorine.
I have never done it with a tank, can anyone think of a reason not to?
I hear baking soda is sometimes use as am anesthetic for fish.
Baking soda is a pH buffer I believe. I know people use it in SW tanks