So mister science teacher dude, chemistry isn't really my thing, but is it correct that if the chlorine or Cl compound oxidises on organic compond/cell it will have bonded with what ever it has oxidised & it will be become stable.
So extrapolating from this, a big water change all in one hit will have a negative effect on the bacteria and the fish.
A continuous slow drip into the aquarium will see the Chlorine almost immediately used up by the large mass of organic material in the tank.
Therefore a continuous dripper system (which I use on my breeding tanks 2-4 litres/hr) will provide pretty stable conditions, with very little free chlorine zapping around causing damage?