Just to share my personal fish keeping experience on using anti chlorine.
When I first started out fish keeping, I didn't always use anti-chlorine. Although my fishes do survive during the water changes, there were frequent casualties. My goldfishes and bettas that were more hardy usually survived these water changes. However, I do note that over time that my goldfishes do lose their liveliness and shine on their scales. And for bettas, you can actually see a drastic degrading of it's form and color over time.
While I can't say I know the scientific reason for using anti-chlorine, I found that it helps improve the health of my fish when the water is treated.
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