Small metallic color balls (Red Sea)

I've seen those small (1-3 cm diameter) balls in Red Sea many times. They looks like metallic color big drops of dried glue attached to the floor. They might be some kind of larvae. What are they?

It's a type of green algae called Valonia, commonly known as bubble algae or dead-man's eyeballs.

It's a one-celled alga. Common name: sailor's eyeball.

Leslie types faster than I do! Damned cheap keyboard.

Hi, Leslie.

:-D I probably just started typing sooner than you did. Hope we see you at LAUPS one of these days.

Thank you both. Single-cell algae. Can't belive my own eyes!