Mardel (Virbac) AMD03315 Fish Maracide Freshwater Medication Solution, 2-Ounce Maracide freshwater medication is a spot on product that treats the fish not the water Highly effective treatment against ick, trichodina, chilodinella and related parasites Contains malachite green and chitosan as ingredient Biospheres technology transports the medication directly to the skin where it is needed This product weighs 2-ounce