[HumbleFish]

Originally Posted by ThRoewer

It is also quite effective against Uronema: Environmental factors and chemical agents affecting the growth of the pathogenic marine ciliate Uronema nigricans

The study conducted tests in the 1 - 8 ppm range. My understanding is that fish should only be exposed to Malachite Green at concentrations of 0.05 ppm - 0.15 ppm.