Fairly common on night dives here are these basket stars.
They are pretty mobile and use their filigree lace-like basket arms to filter microscopic plankton out of the water and feed it into a central mouth. Unfortunately they are rather sensitive to sunlight and will coil up on themselves and hide if lit (the one above is midway through doing this). This makes for a rather messy photo so on our last night dive I focused on getting a single finger/frond/arm (whichever you prefer in the act of curling).
This was my best effort and I really rather like it.
[This is an automated post, I'm travelling so comments might not get answered immediately.]