You have quite a huge tank now Xelinu. Your oscars will enjoy themself alot. In my opinion, the main question to be asked here
is not really how many oscars can I hold in the tank, but what should I do with the other Oscars when 2 of them pair up ???
It is not only the size of the tank that counts but also the filtration you are going to use. I would say that 6 oscars can live quite
comfortable in your tank now. But look ahead not just when you are purchasing the oscars when they are small in size because you
know they grow up very rapidly and in no time you'll have a pair and the other 4 fish will probably need a new home.