This product contains Victoria Green, also known as Malachite Green. As such, it should be used sparingly for loaches. You might try half a dose, but if you do, make sure the water quality is in good shape by performing a water change. Also, ensure that your pH and alkalinity are more on the alkaline side, and not on the acidic side. Keep plenty of filtration and aeration going as well. Loaches are very susceptible to most medications.
Date published: 2017-01-09