Hello!
Mold is sort-of an odd thing to have growing on sphagnum (I assume that's the moss of which you speak) Either there is a distinct lack of airflow, or some type of foreign object is causing it to mold. Just dig out the mold, don't be too concerned with "killing" the new growths, they ought to be fine it you're gentle. Soak the whole deal in a physan-or-similar bath. Really, you could re-pot, as any damage done re-potting will pale in comparison to a heavy case of rot.
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