The blue-green stuff in the middle?
https://www.nps.gov/yell/learn/nature/thermophilic-archaea.htm
https://www.nps.gov/yell/learn/nature/thermophilic-communities.htm
second individual, no white markings on this one.
Dusk dive under the newport beach pier. Max depth 7m
Dead animal that was found washed up on the beach