These are two opalescent nudibranchs. They are only around an inch long or less. Shot in a tidepool at low tide in Santa Cruz, CA. I don't have an underwater housing for my camera, so I shoot through the top of the water and use a CPL to cut down on reflections. 100mm f/8 1/200 ISO200 using a handheld off-camera flash with a homemade diffuser.

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