Dip fillets in melted butter. Sprinkle 1 teaspoon seasoning evenly over both sides of each fillet. Press seasoning into fish, and place on wax paper.
Heat a large cast-iron skillet over medium-high heat 10 minutes or until smoking. Place 2 fillets in the skillet, and cook 4 minutes on each side or until lightly charred. Transfer fillets to a serving dish; cover and keep warm. Drain butter from skillet, and carefully wipe clean with paper towels.
Heat skillet 5 minutes or until smoking. Place 2 fillets in skillet, and repeat cooking procedure. Repeat with remaining 2 fillets. Serve with lemon wedges.
Note: For testing purposes only, we used Chef Paul Prudhomme's Magic Seasoning Blends Blackened Redfish Magic for seasoning.