This has eluded me for a long time. Yesterday I finally managed to capture them on camera. I had cleaned [siphoned] the bottom debris on the liner so that I can view a clear background. There was some sunlight also in the morning to that corner of my small pond. I had put in some fish food. So they all came - there are about 9 in number. They are quick. They catch food and disappear beneath the lily leaves. I also found this link and got some information. This has been in my pond since 3 years and enjoying their stay and lives! http://en.wikipedia.org/wiki/Tiger_barb
P.S. I also discovered now, that I can attach more than one picture per post!!! This is nice!