Is Malachite Green safe for all fish?
Malachite green is not for use with scaleless fish. Caution should be used when treating sensitive species such as tetras, barbs, dwarf cichlids, catfish, loaches, livebearers, gouramis and mormyrids. When treating these varieties pay close attention for signs of undue stress. If undue stress is observed, discontinue treatment, perform a partial water change, and start carbon filtration to remove residual chemical.
