Sorry to hear that. There is no good way to treat for these in a setup tank. Of the corals in your tank, how many are acropora? AEFW will leave other corals alone. If you can remove the acros, then AEFW left in the tank will not have food and die. Dipping the coral in Coral RX is the most effective way to remove.
I have read that some reef keepers that have AEFW, have been able to keep them at bay with just shooting water at the colonies with a baster on a very regular basis. The Melanurus wrasse is sometimes known to eat AEFW.
There is also a Berghia Nudibranch that is said to eat these worms.