Related Clues:
- Pink hue named for a sea creature
- Marine polyps, often forming reefs
- Name of character played by Olivia Newton-John in Grease (1978)
- William Herschel used a microscope to show that this marine animal is not a plant
- Atolls, essentially
- Seaside souvenir
- ___ reef: warm, shallow salt-water area
- Danny's love, in ''Grease''
- (K) ___ reef
- Canine companion for 31-Across
- Jimmy Buffett's ___ Reefer Band
- Course starting with exam referring to what's on reef
- Constant test for underwater growth
- Pink radical wearing black stuff
- Alexander close to his Andrew