If you are going to use it in the future, then I would use it right away. Although when I have set up FOWLR tanks in the past, I have never had problems using Vancouver tap water since the TDS is so low to begin with. Just make sure you use a good dechlorinizer like Prime. And mix the water a day in advance. Tap water is really not a big deal for FOWLR tanks IME as long as you get rid of the chlorine and heavy metals...
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