Discus & Fish Protector by Discusfood prevents the risk of infection by new fish of external origin. Fish from different systems are carrier of different pathogenic germs. Mixing fish from different origins, may cause so-called „x-contamination“. Often the entire old fish stock falls ill. Correctly used, Discus & Fish Protector prevents the spread of such a disease in about 95% of all cases. Your valuable fish stock will be protected.