I would not recommend acclimating anything over 1 hour. Temps get colder as the time gets longer.
Sea hares take about 30-45 on average without problems with us, and that is after they spent 2 days in a bag from overseas.
Give the sea hare till morning, if he doesn't move then give him a light poke. He should be soft if alive or dormant, and be rubbery if dead.
They are hard to keep at the best of times.
Reason for the seahare? I'm guessing hair algae? Try some mexican turbo snails.
Ken
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