Unwanted minature sponges

[les]

A couple months ago I started having these small white tube sponges appear on my coral and glass. My aquarium is covered with them.
They are tube shaped, about 1/8" to 1/4" long and about the diameter of a pencil lead. Does anyone know what these are and how to get rid of them ???????

 

[beth]

This topic will proabably be better served in the Reef Forum, so, if you don't mind, I'll move it there.