This crab catches the anemones of the sea on each of its claws, making them the nickname Pompom crabs. It has small cheerleaders in shallow areas of India-Pacific. These anemones are in exchange for the benefit of getting scraps of remaining food from these crabs.
This colorful and sting able stuff is associated with delicate hooks from its claws; possibly stack of coin-shaped crustaceans. It's the right size and its size to keep the anemones. It is like a little pinch of lilies in crabs, it is mostly anemones strong claws for grabbing, eating and defending. Apart from this, Natural Bling has 6 wonderful animals and it is to decorate itself.
Source - https://news.nationalgeographic.com/2017/01/crabs-anemones-pom-pom-clones-fight/