There is no need for the bubbler, the fish will be fine in a bag for a good few hours. When you bag them make sure the bag is only 1/4 full of water and the other 3/4 is as full of as much air as possible, obviously make sure the bag is big enough that when 1/4 full the fish will be completely covered with water, DO NOT BLOW INTO THE BAG! Pack the fish as one large fish to a bag, 2 medium sized and up to 5 small. Ask your LFS for one of the polystyrene boxes (or two) that their fish arrive in and pack the bags into the box/es in a upright position, use bags of water with no fish in to pack out any spaces. Seal the box/es up with tape and the fish will be fine until you get to the other end.