Not really many food out there you can change to, Oscars are always filthy eaters. Can't think of anything, actually.
What you can do is have a few bottom feeders help clean up the food. Cories and loaches, for example.
I agree with this. A group of large red hook silver dollars do a fine job cleaning up my oscar tank. Also, for some feedings, I provide algae wafers that do not explode out their gills.
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