I had the same problem early this year. Pending on the amount of pond covered in moss, If he kills the moss it will fall to the bottom and decay.
I took multiple garden hosses and hooked them together, then pulled them across my pond and worked all the moss to one end. After removing the majority of the moss I then sprinkled copper sulfate (its blue crystals) over the remaining moss.
I have a water fall, 4 grass carp and still get moss on my pond. I sprinkle coper sulfate occasionally when ever a little green shows up around the edge.
Make sure he doesn't over treat the pond. Sprinkle a little give week and retreat if needed.



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