Preheat the oven to 375F. Place fillets in a bowl of cold, salted water for 10 minutes. Pat the fillets dry. Put 2 cups crushed potato chips on a large plate. Dip each fillet into 1 stick (8 tablespoons) unsalted butter, melted and cooled and then roll the filets in the crushed potato chips to coat. Lay the fillets on a foil-lined baking pan and sprinkle with the cayenne pepper and lemon pepper. Bake until golden brown, 8 to 10 minutes depending on size and thickness of filets.