What is the harm of poriferans?

Poriferans, commonly known as sponges, are generally harmless and play a crucial role in aquatic ecosystems by filtering water and providing habitat. However, some species can cause harm in certain contexts, such as when they overgrow and outcompete other marine organisms, disrupting local biodiversity. Additionally, certain sponges can produce bioactive compounds that may be toxic to fish or humans if ingested. Overall, while they have ecological importance, their impact can be negative in specific environmental situations.