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Howdy.
You will need to fill the tank with water to find the leak. Start with a little water and see if it leaks. Then up the level an inch and see. This should show you at what level your leak is starting. Once you get that far then we can better decide it there is a fix as Ron says above.
Ipinion (kinda like opinion):
I would not put a whole lot of faith in King of DYI's repair and construction of a tanks that need to hold water for any length of time