Fresh BC Cod Fish Tacos

Name: Fresh BC Cod Fish Tacos
Ingredients: 1 lb Ling Cod or Red Snapper Fillets; 1 c Flour, Divided (Divided into 2/3 and 1/3 c); 1/3 c Cornmeal; 1 tsp Seasoning Salt; 1/2 tsp Baking Powder; Vegetable Oil For Frying; 1 Mango, Diced 1/4; 1/2 c Red Onion, Finely Diced; 1 Jalapeno, Finely Diced; 1/2 c Cilantro, Chopped, Packed; 1 Lime, Juiced; 1/2 tsp Salt; 1 Avocado, Diced 1/4 (Optional); 1/2 c Mayonnaise; 1-2 tbsp Sambel Oelek (To Taste) (Or sriracha); 4 c Shredded Cabbage; 1/2 Lime, Juiced