Fan worms feed on small particles, and they also extract oxygen from the water. They range from many colors including, organge, yellow, blue, and white. When these creatures feel threatened, they pull into themselves and pull a hard cover over them.
Bristle worms also known as blood worms move through sediments and feed off of organic material. These worms have small hair- like bristles all over them. They are more hostile and will even attack other worms. They can also regenerate their body parts if anything happens to them.
There are over 200 varieties of Sea cucumber in the Great Barrier Reef. They filter feed the sand for any decaying animal or plant material. These aminals can live in shallow water all the way down to 2 miles (3.5km) underwater!
The Mantis shrimp spends most of their time burrowing in sea beds. Rarely leaving their home except to eat or relocate. This shrimp has adapted to its habitat by having claws to attack close range predators. They eat softer meat like fish that falls onto the sea bed.
Sea Urchins can be both heterotrophs and decomposers beacuse they feed on orgainic materal that covers rocks when there trying to eat plants/animals. Sea urchins are also in the same family as a sea cucumber who is also a decomposer. They play a major role in the Great Barrier Reef's ecosystem and are mostly present in shallow water.