I have a few people on RC that want to buy some zoas/acans/chalice from me. I have never shipped coral before. I know they need to be in a styrofoam insulated box with a heat/cool pack. How do you determine whether a heat or cool pack has to be used? Any good places in town to get the supplies for shipping? www.shipyouraquatic.com looks tempting, but at $13 just for packing, I'm thinking I can get everything locally cheaper. Any ideas or tips?