To the OP:
Sometimes fat is just fat. Thats not to say its a good thing. If this were a practice embraced by the Cichlid keeping community, or a few prominent Cichlid keepers than I would be all for it. Until I see some reputable people recommending this I would be very wary. Not a lot of corn to be found in the rivers of south and central America and the fish have done very well without it.
Oh, and about the Nebraska "corn fed" thing, I'm no expert but I always thought that figure of speech had more to do with the mass raising of cattle and pigs and our feeding them the cheapest, most readily abundant food source we have here in the US.
That being of course, corn.
My .02
Matt