A team effort - thanks everyone! First found by @kayakmak on 12/14, refound (after I left) by @passiflora4 and @chilipossum on 12/16, and today, found in the same patch of bryozoans within inches of the first sighting. This little nudibranch sheltered-in-place despite 15-17' surf at Mavericks pounding the reef during king tides.