Banded Tube Anemone - Pachycerianthus maua - Cyprus

The Banded Tube Anemone Pachycerianthus maua is a nocturnal animal, so it is usually withdrawn during the daylight hours. After dark, however, is when they will push their oral disc out of their tube and extend their tentacles to feed. The aquarist can peak into the “night life” of these curious anemones by Illuminating the nighttime aquarium with a red light, and keeping movements slow.
From http://animal-world.com/Aquarium-Coral-Reefs/Banded-Tube-Anemone

Underwater photos  by Costas Constantinou