Transporting Fish?

Hello guys,

I am recently new to this hobby and is currently setting up my tank but i have realized some fishes at the petstore are really expensive in Canada. I usually go back to Hong Kong to vacation every year. Would it be possible after my tank is cycled and i add a 2-3 fishes from Canada than i bring back a few fishes from Hong Kong the question is

1) Would the fish handle the 15 hour flight to Canada
2) would putting in several fishes into the tank at once mess my tank up, if so how should i add them in?

Thanks Much Help Appreciated

P.S. its a FOWLR Tank