ugh, sorry for the troubles -- you definitely have your hands full here. Thanks for sharing your experiences here; the insights are valuable. I don't know much about this at all, but try a search for treating infections... Hopefully some experts can help, e.g., would tetracycline/oxytetracycline help, iodine?
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This is really rough, I'm sorry your animals aren't doing well 
It seems like transport was really rough for them and I would guess that (plus the rotting mussels) is the reason they are dying so quickly. Do you have any live food like crabs or shrimp you can stick feed them? How many octopuses do you have left?Are you able to get any more when transport conditions are a bit better?
I don't think antibiotics or any treatments are the right way to go in this case, it will likely stress the animal more than it would help I think.
It seems like transport was really rough for them and I would guess that (plus the rotting mussels) is the reason they are dying so quickly. Do you have any live food like crabs or shrimp you can stick feed them? How many octopuses do you have left?Are you able to get any more when transport conditions are a bit better?I don't think antibiotics or any treatments are the right way to go in this case, it will likely stress the animal more than it would help I think.
