Welcome to Reef2Reef!
+1, that is mucus, most likely from skin irritation from a scrape. It won't need treatment. HOWEVER, any new fish has a strong chance of developing infections if not properly quarantined. I see you're in Canada, that makes getting fish medications very difficult.
Watch for salt grain sized white spots, rapid breathing, scratching or the fish stopping eating - those are common signs of illness in new fish.
Jay