Hello.. I have become very skilled at re-sealing aquarium silicone over the years. All you should have to do is completely scrape off all of the existing silicone on the water side only and re-silicone it. Get a nice new razor blade and start by slicing out the thick beads you'd have along the corners, and once it's out, turn the blade so the sharp edge runs parallel to the glass and scrape away. You have to make sure to get it ALL off or you won't get a proper seal with the new silicone. Once it's all off and the corners have been cleaned and dried with paper towel, run a new bead, around 1/4 of an inch or more along the corners and try to do it so it comes out evenly distributed and at a steady pace for each edge. Once you have applied what you feel is enough, run your finger along each bead of silicone in one motion which will help push the sealant into the corners and also give it a nice look. All you need for silicone is a tube that says 100% silicone on it somewhere, go with clear stuff. I've done as large as 100 gallon aquariums with no leaks and the stuff I get costs $10 canadian for 3 industrial sized tubes. A 100 gallon aquarium wouldn't take half a tube.

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