Sorry but I have heard that ritteri's (H. magnifica) are the hardest anemone to keep, and that long term success is rare. I have heard that they need very strong MH lighting and strong alternating water current, and even then they are very hard to keep. Did it climb to the top of the rocks? Because apparently that could be a sign of insufficient lighting.
Have you read the anemone FAQ sheet on carlosreef?
http://www.carlosreef.com/AnemoneFAQ.pdf