Air bubble in glass pane. Is it dangerous?

[marcingo]

I was cleaning my glass today and noticed a tiny bubble on the front glass. Smaller than an oxygen bubble. So I tried to wipe it off when I noticed it is inside the glass. Could this be a weak point that could lead to the pane cracking?

I have only had the tank running 3 weeks and bought it used without any scratch at all. It could be that this was always there or that it just happened.

My main concern is could it lead to a crack? Both sides inside and outside are smooth so this is in the glass.