Pulsing Xenia

Xenia elongata

Common name: Pulsing xenia.
Scientific name: Xenia elongata.
Origin: Indo Pacific.
Is a species of photosynthetic soft marine coral in the family Xeniidae. They resemble a mushroom, with "arms" coming out from the top that end in many-fingered "hands". It is unique among corals because of its ability to use its "hands" to "pulse" or push water away from the colony in a constant, grabbing motion. Common names include fast-pulse Xenia or pulse corals.
It is popular in the aquarium trade due to this characteristic.