Bubble Corals have modified tentacles that get inflated with water so as to provide light for their symbiotic algae.
At night, the bubbles are deflated to make room for other, more ordinary tentacles that capture prey.
They also have another set of even longer tentacles known as sweepers that are used to attack other corals. Those bubbles need their space, after all.
Pulse Corals are unique in that they’re constantly in motion!
Their polyps are long and thin and topped by eight tentacles which rhythmically open and close all day and all night.
It has nothing to do with capturing prey, for these corals get almost all their food from symbiotic, photosynthesising zooxanthellae.
It seems the pulsing actually assists those same photosynthetic microbes. It helps the coral get rid of oxygen so that their guests can better get to work turning sunlight into food.
It also happens to be rather mesmerising!
so this little marine critter is the famous siphonophore (NOT A JELLYFISH) Portuguese Man O’ War
such a cute baby alien, This Physalia physalis was stranded at Olivencia beach, Bahia – Brazil, scaring misunderstood people who didnt appreciate her beauty
A Siphonophore is any of various transparent, often subtly colored marine hydrozoans of the order Siphonophora, consisting of a floating or swimming colony of polyp-like and medusa-like individuals.
EY FATTY BOOM BOOM 