Tetra pond medifin effective treatment for most common pond fish diseases.combination of active ingredients effective against bacteria, parasites, and fungi broad spectrum of activity for best chance of recovery. Supports wound healing by preventing secondary infections.harmless to fish, plants and filter bacteria. Easy-to-use application add 50ml of medifin to every 1150 litres (250 gallons) of pond water.treatment may be repeated after 7 to 10 days, if recovery is not complete, according to the instructions. Medifin can also be used as a preventative remedy, during sensitive times of the year such as the spring and autumn.do not use medifin in conjunction with other pond treatments, except those in the tetra pond range. Always read the instructions carefully before use.