Barrel Sponges what are they and what’s inside?

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Usually not much inside…but I often look anyway because have to know.

Barrel sponges are filter feeders found in tropical coral reefs, known for their iconic vase shape designed to maximize water flow. Though they look plant-like, barrel sponges are actually simple multicellular animals. They consume organic matter for energy, filtering bacteria and nutrients while supporting small marine life like shrimp and crabs. These ancient animals can live over 2,000 years, and based on its size, this one is estimated to be around 30 to 60 years old. Barrel sponges regenerate when damaged and play a vital role in recycling nutrients, making them essential contributors to reef ecosystems.