I would bag the smaller fish separately using bag buddies. (I don't use quite as much as recommended on the package though.) You can get larger bags for this, like they ship gold fish feeders to the pet stores in. The bags will keep them from fighting along the way and the bag buddies will sedate them so they don't stress as well as providing oxygen. They can be rebagged along the way if need be... you could even use a 5 gallon bucket instead of a bag, just leave 2/3 of the space for air. Feed them well up until 24 hours prior to packaging. Then withhold food. This prevents them from defecating in the packaging water and preserves water quality longer. I have had shipped fish delivered to me that last a week in the packaging without food, but I wasn't happy they went that long without. I would recommend bag buddies for each container if for no other reason than to reduce the stress on the fish... they won't eat much at all under sedation, but it seriously slows their metabolism for a while so they don't need as much food. Just my 2¢.
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