Bubbles on top of water?

[Tiger.]

I've got a new tank that just finished cycling. It only has plants and two nerite snails in it. I've started seeing these bubbles on the surface of it, and I don't know if I should be concerned.

 

[Aiken Drum]

Probably nothing to worry about. Surface agitation can cause bubbles to form like that, so thats the most likely cause.

You dont have fish in there yet so its unlikely to be surface protein.

If its caused by soap or detergent thats another issue.