I would still have to say that, in it's current configuration and maturity, your tank is not a suitable home for this anemone. I know it can be difficult to resist, particularly when it is a good deal. I can say from experience however that it can be even more heartbreaking to see an animal perish, or even worse, have a tank crash, because of impatience.
I would wait 6 months to a year of stable operation before even considering an anemone.
Words that I have always lived by, when it comes to my aquarium..."Patience is the key, the only thing that happens quickly in a marine aquarium...is catastrophe!"