You can use any fish of your choice for this recipe. Do a taste test of the mango to see the sourness and add accordingly. You can also add coriander powder along with chilli and turmeric powder, if you like. The flavour develops as the curry rests, make sure it rests for some time before serving. The curry can be refrigerated for 2-3 days. I used coconut milk powder for this recipe. To make medium thick coconut milk, add 2 heaped tbsp coconut milk powder to 1 cup lukewarm water and for thick cow milk, add 1.5 – 2 heaped tbsp cow milk powder to 1/2 cup lukewarm water. You can adjust the powder-water, ratio to suit your requirements.