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They are in my tank now and I already see them starting to inflate. Mine are on the bottom of the tank and if you look at the photo of the month for May that is mine and it pretty much stays like that all the time.
I have a huge pack that is frozen and we just break a piece off thaw it in saltwater and feed. To expensive to throw out I would think as long as it is frozen and kept well wrapped it will stay for a long time.