When you know and understand all the reasons not to buy an anemone, then you may be ready to own one. I have kept Ritteri, Bubble tips, and Sabea. I have lost 1 sabea and 1 ritteri. I have had bubble tips, and ritteri split in my tank. I f you are looking to get a typical clown host type anemone here are my words of advice.
1. Wait at LEAST six months to get an Anemone
2. Anemones need strong lighting with in the 6500k-14000k spectrum
3. Feed feed feed your anemone. I feed my ritteri at least once a day(Krill, squid, and silversides)
4. STRONG RANDOM currents, alternating not a constant blast.
5. Be prepared to (depending on tank size) give up half of your tank to their hapiness
6. IME they do better with out RO/DI, I use plain RO, not because of tightness of money, but a decision
7. Start with a tank bred BTA, and be prepared for some wandering, and possibly losing corals to it
this list is just a small sampling. I talked to the every marine biologist, hobbyist, professional I could get to talk. I personaly think anemones are able to kept with success in a aquarium...it just means giving up a lot of other things and doin a LOT of research. Here is a pick of one of mine. HTH