bubbles

[foxface]

Why am I getting air bubbles on the algae growing on my live rock? the bubbles are a bit bigger than a pin head and they are pretty close together. they don't float to the top unless disturbed by a fish. Is this good or bad?
The pic is under blue lights...

[Murfman]

It is not going to hurt anything but you might want to track down why you have algea growing on the rocks.

[Teeka01]

They are caused by the algae. When the algae leaves so will the bubbles.