Hard coral (Stylophora sp.) fluorescence. A crab sits between branches.
 This picture was very challenging as the crab was mobile and I had to stack a lot of shots to get the entire depth of field.

 Tiny crab fluorescence

 Hard coral (Stylophora sp.) fluorescence. A crab sits between branches.
Blending In
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Juvenile SCALY LITHODID on PAINTED ANEMONE. Keystone Jetty, Whidbey Island. March 11, 2013
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See photo in original gallery.