As a professional painter, we often run into mold. If its just surface mold, bleach will do the trick to kill it(there are also products out there specificaly designed kill and prevent mold), but if the mold has gotten deep into the drywall, the drywall will need to be replaced at some point. Sealing it up for the time being should prevent excess moisture and slow down the growth as well as prevent the mold spores from getting airborn but it will most likely continue to grow and spread behind the tub liner.
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72 gal bowfromt mixed reef sps dominated, 25 gal mineral mud type sump/refugium Skimmerless
2x250 14000k phoenix hqi 2x96 pc actinic, 50x flow
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