I had AEFW and lost a lot of nice colonies. I ended up removing the worst and eventually won out by daily basting my acros and letting my Chromis eat the free floaters. Tried every type of wrasse possible with no luck.
I saw this the other day. Zeo has a new tank safe treatment out. Worth a shot.
http://reefbuilders.com/2012/01/18/zeovit-flatwormstop/