Sean,
As long as it's non-commerce/profit and due credit given, no problem.
Sparkss,
Agreed that we need a more controlled experiment but at this point of my fear and fright, my tank as whole will have to do.
I should mention that I decided on this treatment of using FWE after having dropped one drop over the pictured flat worm while it was in the bowl of water. It instantly reacted by twisting and contorting with a gooey mess of death within minutes. After adding several more drops to the bowl and five hours later, all the 6 or so other worms were in the same state of death. The five hours was because I left home and returned after five hours. They may have died much sooner and probably did.
Joseph