Hey zenners. This is my first post. Loving zen cart so far but pretty full-on when you are a programming novice.

I have searched the forums for this but I can't find exactly what I need. I have the latest version of zen cart. I am building a aquarium supplies & live fish shop.

The "dry" goods side of it I think I can work out. What I need help with is sending live fish. What I want to happen is this. If you order just one fish, it goes in one bag and you get charged for the smallest air freight amount. Consequent fish would then not add to this amount up until a weight threshold where I would then have to use additional bags and thus additional water & weight. I also need it to prevent 'unmixable' fish species from sharing a bag and splitting freight costs AND I need the cost per kg to vary based on location. Expect a decent donation if I can get this to work. Thanks in advance to the clever person who knows the answer