Dear Vijay,
Ornamental fish farming is a very good & profitable business. You need continuous supply of fresh water. Get your water analysis done before you choose which fishes to culture. Fish varieties you can culture depends on the waters ph, hardness, salinity. Also contact the local ornamental fish breeders as you also have to culture live feed & worms for feeding your fishes.
Send me a private message if you need more help. I am in Mumbai.
Sushil Kapoor