Edmonton uses chloramine to treat their water. Running a dechlorinator or RO unit in Edmonton is a gamble due to the ammonia bond.
I doubt it had much of anything to do with the dead fish, but I agree that a RO/DI would be a good investment, and probably solve your algae problems as well. Edmonton's water tests really nice on a TDS meter, but the chloramine makes a proper RO/DI necessary in my opinion. You can get a decent three stage RO/DI on ebay for around 170$.
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