bubbles in tank??

[swmmnglessons]

For the past few hours I've walked by and glanced at my aquarium and there are lots of tiny bubbles floating on the surface around the edges of the tank. There's a large grouping in one area. I have one gourami. Could it possibly be making a nest or what? What should I do??

 

[fishfreek]

what else is in the tank?

 

[swmmnglessons]

I have the one gourami, an algae eater, 4 tetras and a frog...