that is a wonderful story...almost making me want an oscar.
almost
anyway, as amusing as the story is that type of behavior (tank ramming in particular) is not the norm with oscars. most oscars will not ram the glass and break tanks such as Oscar did.
As for the 100 gallon tank in question, I'd look at no more than 2 oscars just to be safe. out of curiosity though, what are the dimensions of the tank?
ps. I have a gut feeling that story might have been
embellished just a tad.