divewizard:
Stylaster californicus (California Hydrocoral) - Farnsworth Bank, California
Robin Gwen Agarwal (ANudibranchMom on iNaturalist):
Phidiana hiltoni
Jeff Goddard 32:
Janolus anulatus (Tarpits)
matt "smooth tooth" knoth:
The Enteromorph-Eating Sap Sucker