Having the reef tank set up for 9 yrs seems it has got everything. The list is: Bryopsis, bubble algae, red cyano, red bugs, red planaria, aiptasia, bristle worms, limpets all of which were not too dificult to get rid of or live with.
The aefw or other flat worms (except red planaria) are however too destructive to keep acros thriving.
Even after dipping it is apparent that flat worms remain on the acros. I make this statement after dipping a heavily infested colony that I knew I would discard. The dip removes a lot of aefw after 15 mins, then I dipped it again and again and still had more flat worms come off, this dip would no doubt also kill the acro. It is also apparent that there is no dip that completely kills aefw, just stuns them making removal easier.
I can also say that dipping the acros with rock then rinsing with clean tank water and replacing really affects the biological balance of the tank, causing generalized stn. Dipping is sometimes deadly to deep water acros. Probably the only way recover from this pest would be to frag the tips of the acropora and set up a quarantine tank where coral can be easily dipped.