I would let the BTA split naturally when it is ready. Feed it once or twice a week will help it split from what I have read.
Here is RC's Anemone FAQ....
http://www.carlosreef.com/AnemoneFAQ.pdf
RC's Anemones & Clownfish Forum....
http://www.reefcentral.com/forums/fo...?s=&forumid=36