A Concentrated Formula and Broad-Spectrum Treatment for Freshwater and Marine Fish to treat External Parasites, Dinoflagellates, Marine Velvet, Gill Flukes, Clownfish Disease, Bacterial Infections, Tail & Fin Rot, and Stops Secondary Infections. Rally PRO is a very effective broad-spectrum concentrated 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 PRO also treats gram negative bacterial infections, fin and tail rot, etc., and prevents secondary infections. Rally PRO is safe for all fish (including scaleless), corals and invertebrates and will not affect biofiltration. Apply Rally PRO once per day for at least 3 days. Longer treatment periods may be required for heavy or persistent infections.