Perfect Fish Tacos

Name: Perfect Fish Tacos
Ingredients: 1 1/4 pounds cod fish; olive for for drizzling; kosher salt and freshly cracked black pepper to taste; 1/2 teaspoon red pepper flakes; 1 lime; 1 orange; 8-10 corn tortillas (warmed); 1 recipe Guacamole; 1 recipe Chipotle Salsa; 1/3 head green cabbage (shredded (about 1 cup) ); 1/3 head red cabbage (shredded (about 1 cup) ); 1 large carrot (grated); 1/2 yellow onion (thinly sliced); 1/2 cup apple cider vinegar or red wine vinegar; 1/4 cup water; 1/2 teaspoon salt; 1/2 teaspoon brown sugar; 1 teaspoon dried oregano; 1 teaspoon red pepper flakes