Lay fish on a baking sheet and sprinkle with blackened seasoning mix. Spray fish lightly with non-stick cooking spray; set aside while the grill preheats.
Preheat grill to medium-high heat. Place fish flesh side down on the hot grill. Grill fish for 7 minutes on each side. Let rest for 5 minutes, then cut or flake fish with a fork.
Place the tortillas on the grill and grill for 30 seconds, or until heated.
Make the lime cilantro crema by adding all ingredients to a bowl and mix to combine.
Divide the fish among the warmed tortillas. Garnish with red onion, green onions, cilantro, avocado and lime cilantro crema. Add hot sauce to you liking.
Serve immediately and enjoy!