Once the silicone dries new stuff wont stick well. If you cut out the corners and the Glass on glass seem is still good you can just redo the corners. It wont be as strong as a total new seal but you will still have the seal from the glass to glass as well as the corner seal just not a significant seal between the two.
-- Your millage may vary.
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210 Gallon slowly gaining population.
Foxface, Naso, Coral Beauty, 2 Clowns, 2 Chromis, Orange Anthias, and Striped Goby.
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