SmellyAngryMan - I don't mean to sound like I'm having a go, just trying to provide the best advice.
I hope yours does well, but unfortunately it is not usually the case - and 1 month is still fairly early days.
With good research and meticulous care it is certainly possible to keep an anemone, even with little experience.
However, in the majority of cases, anemones die when bought by beginners - I speak from experience. Although I feel I now have the knowledge to be able to keep more difficult species, I would still be very hesitant about getting one.
Also, tomato clowns are less likely than some others to actually use an anemone.
willtang - i am not sure how much previous experience you have, or if you are the kind of person that will spend a lot of time making sure conditions are perfect - if you think you can handle it then go for it, but you have been warned.