In order to survive in this huge community underwater world, other than camouflage, hide & seek, commensalism seem one of the most commonly adaptation.
This goby is working hand in hand with snapping shrimp. Snapping shrimp good in burrow but with poor eyesight. By having goby take on the duty of watch tower, is a win-win for both the goby and the shrimp. The shrimp has poor eyesight, but is good at constructing and maintaining a burrow. The goby on the other hand has good vision, but not good at creating burrows. By pairing up, both offer valuable protection on the reef.A Nardoa novaecaledoniae sea star sitting at the bottom of the coral reef.
One of the most photographed critters by divers non other than sea slugs that come in all colour and shape known as nudibranch such as this Goniobranchus geminus
Goniobranchus leopardus
Hypselodoris tryoni in trailing position.
Hypselodoris apolegma that with very bright colour.