Interpet Aquarium Anti-Internal Bacteria No.9 100ml Internal systemic bacterial infections are a common cause of death in aquarium fish, previously only treatable with veterinary prescribed antibiotics. Anti-Internal Bacteria is a breakthrough product, on general sale which halts the progress of bacterial problems and prevents them from spreading. There is a handy pipettte and measuring cup, there is also a chart to calculate the required dosage as well as a chart to aid diagnosis of alternative fish problems This 100ml bottle is enough to treat 500 Litres (110 gallons). Price: £4.29 Quantity: