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Making the world better, one answer at a time. Cnidarians are important in balancing the ecosystem, as all other organisms are. If there were a decrease in numbers, other living things which rely on cnidarians would also have problems.For example, when a jellyfish kills a fish for food, it is actually helping the other populations of fish that would need to compete with the one slain for food, territory, etc.es, many species of cnidarians have powerful stinging cells and potent venom strong enough to cause injury and or death to humans. These include the Portuguese man of war, th â¦ e sea wasp, lion's mane jellyfish, fire coral, and the carpet sea anemone.
This technique allows for them to appear docile. Another piece of evidence is a group of animals known as Cnidarians, more commonly thought of as jellyfish. Cnidarians are slightly more complicated than Porifera's because they can actually move because they have two life cycles unlike Porifera's, the Medusas Stage and the Polyp Form. The Medusas Stage allows for the cnidarians to actively move using their long tentacles to pull the water into themselves to gain nutrients.