Do nothing, it will be fine. The chlorine will just evaporate out with water agitation anyhow. FWIW I top up my FW tank every day or two with anywhere from 3g to 5g straight out of the tap. I've had reef tanks where I ran the water straight out of the tap for topup as well. No chloramine in Calgary as yet so no worries there.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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