Martha, I haven't gotten this priority mail thing figured out yet and I feel like I have traumatized Daphne enough with sending her dead stinky fish. I was thinking I'd send her some fish the way everyone sends discus to get her fixed up and say thanks. Then I am thinking I will put one fish at a time into a heated box where the ambient air is kept at ~84 degrees. Then I can monitor the fish in the bag. If I see it looking bad I can take it out of the bag. I figure I need to be able to keep them going at least 5 days this way. Then I will try in a shipping box with a heat pack that's setting outside on the back porch. I am going to have to get a different brand of heat packs though. I don't trust these things I got. About the welding oxygen, I have been reading and it appears that there are 4 grades of oxygen. While they sell them by grade and at different costs, they all come from the same manifold. They are all the same. Now isn't that a racket. Welding oxygen and medical oxygen and aviators oxygen all come from the same place when the tanks get filled. Read up on safety of oxygen use before using it. Oil is very flammable with oxygen.