Season bangus with salt and pepper. Sprinkle calamansi juice all over the fish.
In a deep plate, combine cornstarch, flour, salt and pepper. Mix until well combined. Dredge the bangus until well coated.
Heat cooking in a pan and fry the bangus until golden brown. When done, transfer to a wire rack and let it cool. This way the skin will be crunchy and not soggy.
Heat about 2 Tbsp of oil or butter in a pan and sauté onion and garlic until fragrant. Add the tomatoes and stir. Simmer until the tomatoes are soft.
Add carrots and potatoes and a little bit of water about 1/2 cup. Let it simmer for 2 to 3 minutes until the carrots and potatoes are fork tender.
Add curry powder, coconut cream and 1/2 cup water. Simmer for a few minutes while stirring.
Season the sauce with patis and sugar while stirring. Add siling labuyo to make it slightly spicy.
To assemble the bangus curry, put the fried bangus in a serving plate and pour the curry sauce over the bangus when ready to serve.