Great species! They are very difficult typically in the beginning, being very susceptible to the stresses of shipping. Be sure to keep a really close eye on them to make sure they are not showing signs of disease like heavy breathing, cloudy eyes, clamped fins etc.. If they do start showing signs, I recommend a hospital tank that you can properly medicate them in that is seperate from all your other animals.
As far as anemones go they are almost exclusively found in Heteractis magnifica in the wild. I have seen footage of a lone inividual found in Stichodactyla mertensii though. In captivity I have seen them in several different species including E. quadricolor, M. doreensis, S. gigantea, and H. crispa as well as H. magnifica. I hope this helps.