I have had a lot, and I mean a lot of sucess with anemones. The key to keeping them happy is:
1. DO NOT MOVE THEM!!!!!
If you move them, they die.
2. Do not let ANY levels of your water parameters fluctuate.
They need a rediculous amount of water stablity. They do not need pristine water as much as they need the levels to be stable.
3. Feed your anemone.
The common belief is that they need bright light. Not true. If you put an anemone under bright light, the first thing he will do is hide. Anything more intense than NO's will slowly kill off your anemone.
(an unrecoverable dying anemone can appear and act normal for more than a month before it starts showing signs)
2-3watts/gal is enough light for an anemone to thrive. Just feed the d**n thing and you will have no problems.
Of course, this information will be disputed by readers of this board, but I highly doubt they have anywhere near my experience with anemones.