Drizzle sea bass with lime juice and sprinkle with cumin, salt and pepper. Coat cold grill rack with nonstick cooking spray; preheat grill to medium-high heat. Grill fish 7 minutes on each side or until fish flakes with a fork. Cut fish into 8 pieces.
Top each warm tortilla with 2 pieces of fish; divide lettuce, tomatoes, cheese and cilantro among tortillas. Top with lime wedges, salsa and sour cream, if desired.
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