You don't need to remove the top trim. But you do need to remove all the silicone. Just scrape all the silicone out from all the corners of the tank. Don't cut between the glass seams. Use several new sharp razor blades. I wipe the corners down with acetone before applying silicone, it removes any oil from your fingers. Use masking tape to set your seal width on the sides of the glass. Have a roll of paper towels on hand and more than enough GE silicone 1. I start with the side corners first. Apply a generous bead of silicone and wipe it with your fingers, spoon, sealant widget thingy, or whatever you choose. Just don't make it too thick over the tape, pull the tape after smoothing the corners while still wet, you will get nice sharp factory appearing corners. If you make it too thick it will leave a nasty edge when you pull the tape. You don't need to use tape around the bottom because you wont see it. Work fast and be prepared for the fumes. I would wait at least 3 days before filling the tank or longer if you can, just to be safe.
