Common name: Boring Sponge

Halichondria is a genus of sponges commonly known as the Boring Sponge due to its ability to bore into calcareous substrates, including coral and shell material. These sponges are important in natural reef ecosystems for their role in bioerosion, helping to recycle calcium carbonate. In the aquarium, they can be both a fascinating addition and a potential threat to coral structures if not monitored. They typically display a range of colors from gray to brown and have a rough, uneven surface texture.

1. Common name: Deadman's Finger sponge

   Scientific name: Halichondria bowerbanki
2. 
   Common name: Yellow Sponge

   Scientific name: Halichondria cartilaginea
3. 
   Common name: Breadcrumb Sponge

   Scientific name: Halichondria panicea