Preheat Grill For High Heat. In A Medium Bowl, Mix Together Corn, Red Onion, Jicama, Red Bell Pepper, And Cilantro. Stir In Lime Juice And Zest. In A Small Bowl, Combine Cayenne Pepper, Ground Black Pepper, And Salt. Brush Each Fillet With Olive Oil, And Sprinkle With Spices. Arrange Fillets On Grill Grate, And Cook For 3 Minutes Per Side. For Each Fiery Fish Taco, Top Two Corn Tortillas With Fish, Sour Cream, And Corn Salsa.