If you could squeeze another light and keep it up really high, you might be okay. Try to find one that has been kept under T5's or PC's if you can, which isn't easy since most LFS's keep their anemones under halides :-(
Anything can be done, I have a Maxima Clam in my biocube under PC's and it's flourishing. I actually raise them in there and then sell them when they get too big, people go crazy for a Maxima that was raised under PC's, because then they can put it in a tank that doesn't have 50000watts of Halides, LOL.
I just noticed that over time my RBTA got really gross looking under PC's and honestly, I think it would have died if I hadn't moved it to ther other tank. I'd try to squeeze another bulb or two in there if you can, maybe even a T5 if possible?