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I'd buy them a RODI unit for Christmas, and have them get a Phosban reactor and run carbon in it. Change that out once a week, it should help polish the water.
Since particles are likely settling in the rocks and on the sandbed, I would use a turkey baster or powerhead and blast the rocks to get the junk out. Maybe put a filter sock on the return while doing this so you can quickly and easily get some of the gunk out of your system.
Something I like to do between water changes is put a siphon tube on the tank, and have it return to my sump. At the output of the siphon I put a filter sock. It's not terribly different from that last idea, but this way you can target the spots with the siphon for debris removal.
Hope that helps.
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