CBAS is the abbreviation I use to designate a common blue aquarium sponge we keep in our salt-water tanks.

I dubbed it so because this species…

  1. is Common in salt-water aquaria as judge by the multiple hobbists complaining about it.
  2. is Blue, but we also have a purple one and a green one.
  3. it leaves in Aquaria, and we have no information about its biogeographic origin. And,
  4. is a Sponge.