Coralline algae? growing on a rock.
Little dead crab blowing around on the sand.
Teensy baby fish diving headfirst into a hole.
They look funny as juveniles. One hanging out in a school of Blackfin Chromis.
Little cone crawling on a rock. About 1-1.5 cm.
Tiny fish under the overhang of a rock in a sandy area.
Hydroids on a rock.
Blue ones, too.
Tucked down in a coral head.
"This small crab creates and inhabits chambers in Cauliflower Coral and Antler Coral [...]. Each chamber has a small pitlike entrance surrounded by pinkish discoloration. Females, larger than males, are imprisoned within their chambers"
--p 289 in Hawai'i's Sea Creatures by John Hoover
In a sandy rocky area.