Place fish in a large dish. Combine tequila, triple sec, lime juice, salt, garlic and 2 tbsp. oil and pour over filets and rub into fish. Cover and marinate for 1/2 hour at room temperature, turning fillets once. Combine tomatoes, onions, chiles, cilantro, sugar and salt to taste. Heat the grill or broiler to very hot. Remove fillets from marinade, pat dry and reserve marinade. Brush fillets with oil and grind pepper to taste over fillets. Grill or broil for about 4 minutes per side. Meanwhile, boil marinade in saucepan for 2 minutes, remove garlic cloves and spoon a little over fish. Spoon salsa over fish and serve.