Was doing a water change on this aqueon 55 gallon I have had up and running 9 years. Never moved it from the spot it's in. It's on a full stand and leveled since day 1. Today after the 20% water change, I noticed real small air bubbles in the right seam. From the top to the middle are these small bubbles. My paranoid mind has me nervous lol. The inside silicone has been chewed a little. You think its going to leak. Im kinda scared considering im on the 3rd floor apartment.