Nudibranch by Dermal Denticles via ferrebeekeeper: Gastropod mollusks - Range: shallow intertidal surf to Most are benthic seafloor dwellers, but some float upside down at ocean's surface or swim in water column.
*SAGAMINOPTERON PSYCHEDELICUM NUDIBRANCH ~ Originally described from Guam, this animal is now known from many parts of the tropical western Pacific Maximal size : 20 mm. Frequently on the reef flat zone and the fore reef zone. (psychedelicum, indeed.
Green Sea Turtle eating Jellyfish - Dimakya, Philippines by Ai Gentel --Exactly why it is dangerous for plastic bags to pollute the oceans, because they are often mistaken as jellyfish and kill turtles.
The aptly named Ping-pong tree sponge (Chondrocladia lampadiglobus) is a carnivorous sponge. Those ping-pong ball looking things are covered in tiny spicules which the sponge uses to catch tiny crustaceans.
No idea why this thing is called the Yellow Boxfish! But these bright yellow, polka-dotted, boxy balloon-shaped fish are found in tropical and temperate marine waters of the Indo-West Pacific.---maybe because it's yellow and box like?