anemones can appear to be doing well for a long period of time when in fact they are comsuming their own flesh due to lack of zootanthelle production. not saying this is definitly the case, just saying it might be. i had one anemone back when i didnt know better with regular lighting, and he appeared to be doing fine until about 3 months down the road he died.
it is reccommended that you have MH
lighting for most anemones, you couldprobably get away with PC
with a BTA, they are less demanding than most. i would suggest around 8 watts/gallon with the tank you have described and PC
i would also reccommend that you wait at least a year to add the anemone, they need an extremely stable environment.
are you planning on having a clown that the anemone will host? an anemone shrimp? just interested in your plans.
if i were you i would pick up either fenner's book on reef invertebrates or go to your LFS
or LBS (local book store) and check out joyce wilkerson's book "clownfish" and read the section on anemones.
thats my experience.