air bubbles

Can anyone tell me why I'm get tiny air bubble's ? There on the rock and glass? Thanks for any help.

 

2 possible problems: Either your skimmer is sending out an excessive amount of microbubbles, which can be mitigated with a sponge in the right place. Or the issue i've been having in my sump lately is that evaporation has been excessively lowering my water level in the return section, causing bubbles to form when water is falling further than normal to meet the water line, in turn getting sent back up into the tank.

 

Could be air bubbles on algae.

 

Thanks for the info. I'll check these thing out and update later.