I have a 40 gallon tank that has a small chip between the front and side panel (inside the join)It is second hand and been repaired by having new sillicone. But I have noticed air bubbles inside the sillicone (around and above the chip) My question is this - Are glass tanks glued together or does the sillicone do this. If so I imagine it will still be strong. Thanks
The silicone is what holds the glass together. If the bubbles are very small and not covering a majority of the space it likely will not be a problem.