^^yes, like he said. Resealing isn't too hard but preparation is all! Remove all silicone you can with a razor blade... except for between the glass panels, you don't want to go there!
Remove any silicone residue with rubbing alcohol. Practice with silicone & a caulking gun on a cardboard box. Then, when you know how that works...tape off all the seams, top & bottom, all sides both edges...& caulk. Without goofing around, remove the tape before it dries. With a wet finger smooth all the seals. Bottom to sides, sides to sides, like that... being very aware of the corner seals. This is why practicing is important, you need to do it fairly fast. .but not in "panic mode".
I've resealed tanks many times, you can do it!