On an Edmonton mailing list for aquarium hobbiests, I recently read that Edmonton's water is now going through "the spring" stage where there is much more bad stuff in the water than usual. I would like you to consider using RO or distilled water bought from such places as Safeway for water changes. Comes in blue 5g bottles. Or buy an RO or RO/DI unit for your tank. Will make some difference at least.
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