I generally use Stress Coat, which I dump into all the aquariums right before starting the refill process. Since I usually limit the water changes to 15 or 20 percent, the aquariums don't get overloaded with conditioner even if they wait an hour for more water. In one of its instructions or ads, Python claims that you don't need chlorine removers because of all the bubbles you put in when you fill the aquarium. At least I think I saw that, but tortured old brains like mine are not always reliable, so I don't take chances.
Based on a suggestion posted here, I'm considering using a dry conditioner, which would probably be added during the fill process.