I just saw that you are from India, not Indiana in the US. I though that the comment about buying fish in one of the previous post was unusual.
Some people posted in this thread seem to did not understand the differences between Haddoni versus other host anemones (H. magnifica, S. gigantea, E. quadricolor all mentioned in this thread) in term of fish eating. Haddoni is THE FISH EATER in the host anemones group, especially fishes that crawling around in the surface.
My Haddoni is so aggressive and sticky that he will eat anything. Bristle worms, hermit crabs, crabs, shrimps, and fish. Anything moving and touch him, it is gone. Shells and bones if any are spit out a few days latter.
IME, Haddoni should be keep in a species tank with it's clowns. Unless the tank is large, other mobile animals don't have much of a chance to live a long live. Even in a large tank, if you really don't want to loose certain special fish, best not put it in with an Haddoni. People have even report of Haddoni ate clowfish that naturally live in it (A. clarkii in one post I read a while back)
Our experiences does and should color our interpretation and guide what we do. My experience with Haddoni was not good in term of loosing fish while Todd's experiences was not too bad. Good luck at whatever you choose to do.