overflow structure

[Jack L]

i noticed, the glass behind my overflow has a chip in it, right along the edge... being held in place by the silicone at the seam. otherwise the chip would fall out. its a circle shape.
is the glass behind the plastic wall for structure?
i'm wonder if i need to worry about it, i have no idea how long its been like that.
on the other side of this black wall, about where the circle is drawn.
118888

[Adam S]

Is the chip on the back panel of the aquarium, or somewhere in the overflow chamber?

[Jack L]

its in the overflow chamber.....were to pieces of glass come together. i can't get pic at moment