But before it even got to the point where we're experimenting on fish, a scientist with a group of tomonts could experiment with ginger and see how it affects the theronts once released. See how it affects all the life cycles.
IF it works by effecting the ich and not the fish. Even if proven to not effect the life cycle at all, it wouldn't prove lack of effectiveness.
I'm only continuing to argue as when I've thought "in depth" on the subject, I've kind of come to the conclusion that the only reef safe treatment that would ever really have the possibility of working would be a treatment that worked directly on the fish, not on the parasite. The things that kill the parasite are almost always going to kill other inverts as their tolerances to most things run in the same ranges. IF you could treat the fish to enhance or "poison" their slime coats such that the parasite cannot attach, it dies in the same manner as it does when you fallow a tank. Its a "theoretical" thinking, but its the best conclusion my simple mind could proffer.
I am in no way endorsing the use of ginger or any other treatment for ich.. or that anyone run a "test". Ich is a pain the the arse, but preventable and treatable, and while the treatments are not convenient or easy, they work. So new thoughts on the subject are welcome, but experimentation with a "curable" disease/parasite is often unwarranted given the high probability of loss of life.