Treat and prevent a broad spectrum of diseases that can infect freshwater fish with Tetra Lifeguard All-in-One Bacterial & Fungus Treatment. Parasites， bacteria， fungus and poor water quality can cause diseases including ick， mouth and fin rot， flukes and ulcers. Tetra Lifeguard All-in-One Bacterial & Fungus Treatment is a non-antibiotic agent that treats the clinical signs of these diseases in their earliest stages within five days. It contains the powerful oxidizing action of HaloShield which destroys microorganisms and can be used as a preventative when adding new fish.