Kanamycin

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This is a potent broad-spectrum, gram+/gram- aminogylcoside antibiotic.

It is wonderfully effective for aquarium use because it is one of the few antibiotics that dissolves well in saltwater and that is readily absorbed through the skin of the fish. That makes it the treatment of choice for treating many bacterial infections in seahorses.

Kanamycin can be combined safely with neomycin (as well as metronidazole) to further increase its efficacy.  Like other gram- negative antibiotics, it will destroy your biofiltration and should be used in a hospital tank only.