Didn't see any Cypraea arabica or Saron shrimps also but it was largely daytime during the trip and they were probably all hiding.
Anemone coral.
Tiny Acropora.
Pocillopora.
Turbinaria coral next to Porites?
Soft coral.
Thick mass of eggs (nudibranch?).
Another egg mass-like thing. Polychaete?
Synanceia horrida. These may be more easily spotted by looking out for symmetry in rocks (stonefish are symmetrical left and right side at the head) and the distinguishing curved lines running from the eyes to the mouth above the hollows of the cheeks. Still it is best to just be very careful that the sand is soft before stepping down, retract immediately if feel anything poky and avoid stepping on rubble totally unless absolutely necessary.
Synaptid sea cucumber. They stick to skin when touched, a feeling similar to nematocysts stings but are actually tiny hooked sclerites. Best not to pick them up or touch them at all though as they are very fragile.
Phymanthus.
Five-spot anemone shrimp on Stichodactyla haddoni.
Zoanthids.
Top shell snail with a shell that seems to be encrusted.
Oval moon snail (Polinices mammatus).
Lambis lambis, an exciting find by Marcus.
Archaster typicus seem to be doing very well, covering a very extensive area of the shore.
Elysia ornata.
Pseudobiceros bedfordi.
Pseudobiceros uniarborensis.
Dendrodoris denisoni.
Tanah Merah has a fairly large population of fan worms, some even occurring in small groups like these 3.
Mysterious lump.
Copperband butterfly fish. Fish appear almost immediately after nightfall.
Shrimps, zebra coral and sea grapes.
Cluster of Ascidians discovered by Kok Sheng under a rock.
Completely orange hermit crab, my first time seeing one.
Can't quite see the claw tips properly, sigh. Looks like Orange stripe hermit crab but totally lacking the white nodules.
Atergatis integerrimus.
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