Misdiagnosis is to be expected- but it many cases it makes little diffrence in treatment. Where it makes a major diffrence is when people decide its just a little ich and don`t treat. Big thing is-velvet and whatnot is usually seen during the qt period, when people should be prepared to medicate fish if needed. I have seldom seen a case of ooidum crop up in a tank years after the last fish was introduced- yet its common with crypt.
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