Hold or release with two nights of freeze?

Fly Predator Questions

Hold or release with two nights of freeze?

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My predators have hatched, but the weather forecast calls for temps in the 20's tonight and tomorrow (low of 23 F).  How long can the predators survive in the bag?  I don't know if I should release them or hold them in the bag for another two days.  They have hatched already in significant numbers.

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