Flatworm exit doesnt work for AEFW. You have a few options but none are pretty. You can do the following.
1. Live with AEFW in DT tank and try basting infected corals so AEFW blow off and get eatin by fish.
2. Find fish that eat AEFW ( corris wrasse)
3. Remove all acropora to a QT tank and repeat dips in lugols, revive, tcpmm etc. Place dipped corals back in DT after a few weeks. 2-4
4. Remove all acropora and start over completely.
I actually took option 4. Make sure to keep your DT acro free for a while. I hear AEFW life span is 2 weeks with no food source but never confirmed this myself. I left my DT acro free for four weeks. Unless you remove all acropora from your DT, you will never get rid of these little bastards. So far so good for me.