Here's my thought on a Christmas wrasse and berghia... Berghia are noctural eaters. Christmas wrasses bury themselves in sand at night. Mine goes into the sand at about 5 or 6 PM. It comes out at about 7AM. So in theory, berghia and Christmas wrasses conveniently keep opposite hours. If a berghia is out during the day searching for food, as they may do as the aiptasia in the tank dwindles, the wrasse might try to take a taste, but that's iffy.
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