Algae Barn in the US is a good choice for clean algae. I don't believe that there should be a problem bringing them into Canada because Algae is not on the CITES list.
When adding algae into your tank/ sump you could be getting all the problems of the mother tank like bubble algae, nuisance algae, aiptasia, bad critters like flat worms, predatory copepods, vermitid snails, whelks etc. The list goes on and on.
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