Advanced Aquarist has a very interesting article about how corals use their cilia to effect their environment creating vortexes for food/gas exchanges. It's really interesting and a completely new way of understanding how corals interact and interestingly change their environment - they aren't as passive as we thought. Here's the link to the article if anyone's interested in reading further:
Corals are nature's tiny engineers ? Advanced Aquarist | Aquarist Magazine and Blog
Corals are nature's tiny engineers ? Advanced Aquarist | Aquarist Magazine and Blog

