FWIW you really didn't do much for the integrity of that tank. When you redo the silicone on a tank, you are supposed to take the tank completely apart and then rebuild it. I'm assuming of course that you just razorbladed off the sloppy silicone on the inside of the tank and reapplied a new radius with your finger. New silicone does not stick to old silicone. All that being said, your tank is probably fine.