If your adult oscars are with hith scars, you are doing something wrong...
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Not necessarily. You can do weekly water change, and many oscars still get HITH. Oscars, like discus and angel fish, came from soft water region of Amazon basin and are vulnerable to HITH if the water chemistry is not right.
Exactly, if the water chemistry is not right, then your doing something wrong...
Oscsr guy myself
I think the reason why they are so common to see in cichlid communities is because more often than not, they may have been the start of that community. I've got a large sa/ca community myself and I know that wouldn't be the case unless I had bought an O.