Which of the coelenterates leads an attached lifestyle?

Only the red coral leads an attached lifestyle, since all other organisms belong to jellyfish, which are capable of moving. At the same time, it is necessary to focus on the fact that in the course of their life, coelenterates are able to change vegetative forms, and move from capable of moving to immobilized. But in this case, it is somewhat irrelevant, since neither aurelia nor the cross do not turn into corals and do not lead a “static” lifestyle, unlike many other coelenterates.