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The best medication for pop-eye is kanamycin. Seachem make a product called KanaPlex that works well. It is a white powder and you add it to the QT (good to do this in QT) three times, at 2 day intervals. It worked on my Congo Tetra.
If you do go with this, do a couple major water changes to rid the tank of the tetracycline.
Byron.
Byron Hosking, BMus, MA
Vancouver, BC, Canada
Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]