Vancouver Water does not use chloramine However communities outside metrovancouver Victoria, Abbotsford, Mission BC and other communities where drinking water is disinfected with chloramine.

chloramine Wiki Chloramine removal requires a catalytic carbon filter

Vancouver re-chlorinates water throughout the water system.

Chlorine removal is much easier. Chlorine is not safe for fish

Chlorine is very volatile, If your water is only treated with chlorine, then letting it stand over night should allow the chlorine to evaporate from the water and make it safe to use. Then boil the water to remove the the remaining chlorine and kill an biological material resulting from letting the water stand.