I have maracyn 2, but I have not the idea if it will work against flashing fish. I have used parasite clear, but unfortunately I am out of it and I need to know if maracyn 2 works with flukes. My fish show no symptoms except just flashing/scratching. I have seen my bolivian ram and my other fish doing it. Bah! I think it was some of the new fish I bought maybe. Ah, stupid! To think a salt and medication bath or such is a enough! Nupe!