CrystalClear® KnockOut™ PLUS is formulated to treat Ick parasites, protozoa, bacteria and fungi for most pond fish species. Warning signs that Ick may be present in your pond include fish with white spots, clamped fins, slimy skin, listlessness, and loss of appetite. Pond conditions can cause parasites and disease to affect your fish. These conditions include overcrowding, overfeeding, poor water quality and poor dissolved oxygen content. Rectifying these conditions will help to reduce following infestations among your fish.