Mold is a given with frog species that require high humidity, and is really nothing to worry about on a general basis for many species, and Bombina are no exception. There is no need to rip own the tank or change the substrate. All that is necessary is to do is take the log out, give it a wash in hot water, and put it back.
Bets of luck, and don't hesitate to ask any more questions
Double J
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"If there's a bustle in your hedgerow, don't be alarmed now. It's just a spring clean for the May-queen."
-Led Zeppelin
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