Well jdforever, a similar issue happened when my two young Tiger Oscars met for the first time.
Be careful, this might be the beginning of... a lifetime couple relationship! Mine just became parents! at unexpectedly young age (9-10 months). I'm not kidding, one of them was probably testing dominance over the other. In my case, they challenged each other but without any serious injuries, just some minor bruises.
I guess we might misinterpret the real meaning of this observed aggressive-like behaviour; however, in some rare instances, there have been reports of two Oscars being impossible to keep together as one (or both) being in real risk of getting killed.
Hope they keep this going peaceful
Pepe
Santo Domingo