Picked up a 180g second hand a couple days ago. Previous owner had just drained it a week prior (allegedly) after upgrading. According to him no leaks or issues etc. Upon inspection a couple spots have some silicone that doesn’t look great but for the most part it is good. Whether they leak or not the spots will drive me crazy, and the tank is dry and not set up yet because I have been plumbing the overflows and my sump. My question is can I cut out the sections that look bad and silicone them only or do I need to redo the entire tank? To clarify I’m speaking about the silicone inside the tank not between the glass panes. Thanks for any input!