Marinate fish in paprika, turmeric, salt and 1 tablespoon fish sauce for 15 minutes. Heat the oil in a pan, fry the onion, ginger and garlic. Add more paprika and turmeric, saute 2 minutes. Add remaining fish sauce and tomatoes. Stir fry 3 minutes. Add fish, stir-fry in sauce until the color changes, add water and stir. cover the pan, cook over low heat for 20 minutes to evaporate liquid and create a thick sauce. Sprinkle with cilantro and chiles and serve warm with other dishes.