Blue/Purple Invertebrate or Plant?

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scubadiverjackcook

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Scuba Instructor
Messages
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Location
Southern California
# of dives
500 - 999
I took this photo of a bright blue branched plant or animal on the West Side of Santa Catalina Island in about 35 FSW with a water temp of about 64F. The color balance should be right because the surrounding reference species are the correct color. Is it animal or vegetable? I have been looking for the correct ID for a while with no luck.
Unknown Blue Stuff-1.jpg
 
It is a red alga whose name escapes me at the moment. I was filming it on my night dive last night since the colors are beautiful.
 
https://www.shearwater.com/products/perdix-ai/

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