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Not a pro, but I would think:
1). Tape all duct connections and replace that insulation with something designed for ductwork.
2). Spray down joists with 50/50 bleach and water to kill mold.
3). Insulate underside of house where hot crawlspace meets cold floor, and use vapor barrier with tuck tape. This has to be a complete seal or water will accumulate inside and accelerate the growth. I don't know, mabye a partial vapor barrier like tyvek would be better(?)
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