Preheat oven to 350°F.
Mix tomatoes, avocado, 2 tbsp lime juice, onion, cilantro, and 2 tsp jalapeños in small bowl.
Season with salt and pepper.
Place fish in single layer on small rimmed baking sheet. Mix garlic, 3 tbsp lime juice, and 1 teaspoon jalapeños in another small bowl.
Drizzle half of lime juice mixture over fish; reserve remainder.
Sprinkle fish with salt and pepper; let stand 15 minutes.
6Preheat broiler. Broil fish just until opaque in center, about 6 minutes.
Cut fish into 1-inch pieces. Top each tortilla with 1/2 cup lettuce, then fish pieces. Drizzle
with reserved lime juice mixture. Spoon salsa over; sprinkle with cheese.