Chilodonella is a protozoan ciliate that parasitizes the skin and gills. The back of the head to the dorsal fin seems to be the main target, and this makes it easier to notice and identify. If in the gills much more difficult to notice, yet a tell-tale sign is hanging just under the surface, gasping for air. This is one of the most common issues for the aquarist, and they never even know it. Stores obtain their livestock directly from the farms, which grow them in open-air ponds and facilities, making livestock more susceptible. The stock is not being treated for the proper duration to eradicate this bug completely from the host. Remember, one becomes two, two becomes four, four becomes eight, and so on until, in time, it’s critical.