I managed to crack my tank a few years back while rebuilding it.Was an vintage 1950's toilet .I found some heavy duty marine epoxy and filled the crack with it.I let it dry then covered the front and back of it with another layer.It's held up for a few years now.Toilet troubles are never any fun.Hope you get yours fixed.Could be the gaskets are just flattened and the screws need to be snugged down a little more.
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