The brand I used is Mardel Quick Cure, which is a MG and formalin combination formulation. For loaches, catfish and tetra, the instruction says use half dosage. Cichlids are very tolerant of MG and IME even double the dosage doesn't harm them. Interestingly, my bristle nose plecos can tolerate full dosage even though they are scaless catfish.
Under dosage can be as harmful as no treatment. Make sure you follow the instruction and apply the recommended dosage for three or more consecutive days even though the symptom may be gone. I typically treat for 5 consecutive days to assure complete root out of ick pathogens so they won't return.
Under dosage can be as harmful as no treatment. Make sure you follow the instruction and apply the recommended dosage for three or more consecutive days even though the symptom may be gone. I typically treat for 5 consecutive days to assure complete root out of ick pathogens so they won't return.