Edmonton city water is good but the problems you will run into is in the spring and when heavy rain falls . The water comes from the river and run off from the mountains bring many elements that will not be in a realm of optimum reef leaves. RO water or even better RODI is a clean slate add reef salts mix and good to go for any corals. I have seen softy and lps tanks do fine with city water.
But who wants to struggle with nitrates and phosphates or take chances when doing there water changes . Dirty water could kill sps or give nasty algae problems.
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