Do you have any activated carbon? adding some to the tank will help.
If he has a reactor with carbon in it already on the tank, exchange it for fresh stuff (don't forget to rinse it well before adding to tank) or even putting some fresh rinsed carbon into a media bag (nylons work well for a bag in a pinch, cut the toe and part of the leg to make an approx 10"to 12" long bag and use those plastic bread tags to seal the open end) and placing it in the sump will help a little
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