I always have a ready made 5 gallons of fresh ATO water to go just I case my 20 gallon ATO runs low that the person can fill up.
As my tank is 95 gallons if I happen to be away for 2-3 weeks I can live with no water changes for that period however with a smaller say like 50 gallon tank a lack of a water change could be more worrisome however you live in Edmonton so tons of reefers available to help out so I don't think you would have any serious concerns about tank maintenance.
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 My aquarium is nothing but a smorgasbord for my cats.....
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