Using Chloroquine to Treat Cryptocaryon in Fish Chloroquine, or Chloroquine Phosphate, is an antiprotozoal drug used by marine and aquarium hobbyists to treat fish suffering from Cryptocaryon. The medication is also an effective treatment for Marine Velvet. What Is Cryptocaryon? Cryptocaryon is a ciliated protozoan parasite of fresh water fish. This disease is also known […]