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
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
One main cause is OLD food. Feed good food, not the
previous year's leftovers (check the date stamp on food).
treatments have been tried, but with limited success. Treatment now
available no need to mix with food.