I am in fact ordering some ASAP. Few years ago had an outbreak and bought those nudis and the matted file fish. They disappeared and thought the nudis did it. Well this outbreak I have had the nudis for 4 months and they do a good job but not nearly fast enough. I feed too much and the aiptasia spread too fast. I believe the file fish must have been doing the bulk of the work.
I tried nudis too. I didn't have much luck with them.
I seemed to remember it taking around 3 weeks to notice anything after putting the filefish in my tank. It was a drab green color, I'm pretty sure it was a Acreichthys tomentosus . Within about 3 -4 months most of the aiptasia were gone. I had a 125 gallon at the time. I don't know the size of your current system but one was enough for mine.