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Best I can recommend is to subscribe to the Octopus Availability thread (be sure you have set your preferences to receive member email). If you have a cold water tank, you might PM Joe-Ceph to see if the tides are favorable for collecting bimacs. For a warm water animal, you can email K&P Aquatics and ask to be put on a list. Kara and Philipp don't collect them as a rule but do come across them in their collecting and will capture one if there is a customer waiting. There is no guarantee what they will find but Philipp is getting pretty good at ID's.