I now have the same problem with cryptobia as hexamita.
Cryptobia is a flagellate which is often mistaken for hexamita as they are very similar in appearance.
Cryptobia is more of a pear drop shape, with two flagella, one at each end. Additionally cryptobia wiggles in a dart like manner, whereas hexamita spirals.
Cryptobia is associated with granulomas, in which the fish walls off the parasite. This parasite is primarily in the stomach and has been missed many times as only the fish blood is examined. It may also be present in other organs.
Fish infected with cryptobia may become thin and lethargic (in the states sleeping disease), and will have a dark skin, which gets darker as the infection progresses. As a result, cryptobia is sometimes called black streak disease.
One main cause is OLD food. Feed good food, not the previous year's leftovers (check the date stamp on food).
Many treatments have been tried, but with limited success.
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