Dr. G's Anti Bacterial Caviar Treats Fish Infections caused by Bacteria, like "Hole in the Head", PopEye, Hexamita, Fin & Tail Root, Septicemia, Dropsy, Ulcers, Mouth Fungus and many others. For Marine, Fresh Water Aquariums and Ponds. Will not affect your Biological Filter. Reef Safe. Delicious Caviar MAX creates a "Feeding Frenzy", no fish can resist.