Are you on good terms with your local, helpful fish store? If so, you might consider seeing if they'd house your fish in the back for a week and mail them to you later. You'd have to offer them some decent coin, and you could make it easier by purchasing all of the packing supplies yourself. But it's worth a shot.
Otherwise, I'd say simply sell the fish back to the fish store, wash and pack everything carefully, and start anew when you settle in.
Good luck.