He blows them off the corals with a turkey baster weekly. The fish eat the AEFW's blowing around in the current. This keeps the adult population down, but doesnt stop eggs from hatching.....
To my knowledge, short of removing all acro's from the tank, dipping them in Levamasole or Tropic Marin Pro Coral Cure, (or some other equivilent dip), placing them in QT for 8 weeks,re-dipping every 7 days, and leaving the main tank free of acros for 8 weeks............there is no way of eradicating AEFW's from your tank. Sanjay's method is the best one available to people with large tanks, and large established coral populations who cannot or will not remove their acro's for treatment. Keep in mind, AEFW's are acro specific. They will not eat seritoporas, stylophora's, montipora's or any other non acro hard coral.
Nick