Welcome to the board! Most people recommend RO water as it is guaranteed to be pure water, vs. tap water, which while probably fine on a good day in Vancouver, may have levels of undesirable compounds. Run off, broken main lines, etc, all introduce risk of adding things to your tank that may impact your success. But, lots of people use tap water, so if you have RO, great, if not, maybe plan on it down the road and use tap water for now...
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Brad
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