TetraMedica ContraSpot is an effective and safe control for whitespot and other diseases caused by parasites. - Effective and safe control for all tropical fish showing signs of parasite infection e.g. white spots flicking cloudy eyes rapid gill movements clamped fins and thickened mucus. - Manufactured to highest international (GMP) standards. - Effective against common external parasites such as flukes whitespot and protozoans (single-celled parasites). Add 5ml per 20 litres (4.4 gallons) of aquarium water. Treatment should be repeated at weekly intervals. Prior to redosing it is advisable to perform a 20-30% water change using tap water conditioned with AquaSafe. Read instructions carefully before use.