RALLY is a very effective broad spectrum treatment designed to be used directly in the display tank to eliminate external parasites, dinoflagellates, marine velvet, clownfish disease, gill flukes, etc. on fish. RALLY also treats gram negative bacterial infections, fin and tail rot, etc., and prevents secondary infections. RALLY is safe for all fish (including scaleless), corals and invertebrates and will not affect biofiltration.Apply RALLY once per day for at least 3 days.Longer treatment periods may be required for heavy or persistent infections