Common name: Encrusting Sponge Family

Pycnoclavellidae is a family of encrusting sponges found in marine environments. These sponges are known for their hard, calcareous structures and are often found in reef settings, contributing to the complexity and biodiversity of the ecosystem. They are filter feeders, playing a crucial role in water purification. In the aquarium, they can add a natural and diverse element, but they require stable water conditions and adequate water flow to thrive.

1. 
   Common name: Pycnoclavella diminuta

   Scientific name: Pycnoclavella diminuta
2. 
   Common name: Yellow sea squirts

   Scientific name: Pycnoclavella flava