we don't actaully need to use decholrinator at the moment, we just do a third water change once a week on both our tanks, and there are no adverse affects (we were using dechlorinator originally, but not using it didn't affect the water quality, so we decided to stop, as it was having no beneficial affects to the water quality, which was and still is fine).
i'm asking this simply because a) i am curious, and B) we are moving house soon, and moving the fish into a new tank, which is two thirds bigger than our current tank. we plan on taking as much of the current tank water with us as we can, but will have to top up with tapwater, we will be adding dechlorinator (tapsafe) on this occassion just to be on the safe side (and it is a lot of tap water to add!), but i would like to know for future water changes whether we can carry on as we are, or whether we will have to invest in some more dechlorinator.
ps.. sorry for the miss-spelling of chlorine in the title!!!