Big Hydroids; Hydrozoa

These underwater photos are probably of big hydroids, although some might be Black Corals.

They were all taken at relatively deep dive sites, away from Koh Phangan. We are looking mainly at the wonderful Samran and Southwest Pinnacles.

As with many other hydroids, the naming of these colonial animals is not easy, as they are not common. But never fear, the Chaloklum Diving School team are working on it!