Based on emails back and forth with FM about AEFW-X... it is clear to me it does not actively target the worms directly. They started bringing up trace element shortages, wanted to see ICP tests, etc. If this was a true biocide / treatment, coral health and water parameters would be irrelevant with regards to the efficacy of targeting the flat worms directly. Add this to the long list of AEFW products that don't actually do what they say they do. I place this in the category of "boosting" (probably not) coral health and possibly a worm "irritant".
They also mentioned doing other treatments in parallel, dipping colonies in other products, basting them off, introducing natural predators, etc as keys to "success"... So they are relying on a kitchen sink approach, which again, clear to me it doesn't work directly on the worms.