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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.
Cnidarians are said to be the simplest organisms at the tissue grade of organization; their cells are organized into true tissues. Cnidarians are essentially bags made of two cell layers.