Interpet Anti White Spot Plus No.6 100mlfor use with freshwater fishWhite Spot is the most common parasitic problem in aquariums. This treatment eliminates freshwater white spot.Interpet No.6 Anti White Spot Plus is for use in coldwater and tropical freshwater systems only. Symptoms:Flicking and rubbing against objectsRapid gill movementsWhite spots (sugar grain size) on body or fins One 100ml bottle will treat a 500 litre tank for one course of treatment (two doses)