This is Formalin Malachite Green and Anchor Worm Treatment
Shot Gun Three
Shotgun III is simply using Formalin / Malachite Green in the form of Eco Lab's BSDT with an insect gyrase (CyroPro is used here as an example) which controls ALL parasites of freshwater fish outside the intestine. It combines a broad spectrum against ciliates, flukes, fungus, and crustacean parasites.
As with any treatment, it is VERY important that you have RULED OUT more simple problems like high ammonia or a low pH. The test kit at right is very quick, "pretty accurate" (meaning very adequate) and cheap. The kit has every test you need.