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Thats a perfect way of resealing a tank. I posted the link earlier but i guess it didnt work because i tried to insert the link. You'll just have to copy and paste i guess. As far as keeping a tank with only silicone in between the glass or by only patching the section that is leaking, it may work but personally i wouldnt risk it. It is really up to you though. I can testify that it is a pain in the butt to reseal an entire tank.