I have a couple questions about shipping that I thought I would post in here. I am shipping out some corals in a couple weeks and will be shipping them in a styrofoam box with more styrofoam packing peanuts inside that. I will be using a heat pack and was wondering where the best place to put it would be. Should I put it inside the styrofoam box with the frags and have it resting on top of the peanuts? Or should I leave it outside the styrofoam box and have it between the styrofoam and cardboard? Also where can I find the good heavy duty plastic bags that LFS have? All I see are ziplock and I dont trust those.