sera Baktopur Directsera Baktopur (Bactopur) Direct tablets. Water conditioner effective against bacterial infections of freshwater and marine fish even in advanced stages. These include, for instance, Columnaris disease, fin rot, gill rot, Aeromonas or Pseudomonas bacteria, inflammations and open ulcers as well as dropsy. Notice: The product image shown on this page is a sample stock photo by the manufacturer and should not be used as a size reference. Please read the