my oscars were the same size but they got to aggressive towards eachother nd he killed her broke her jaw nd yer
umm i think you will just have to wait a while
but if you dont want to keep you r pleco n jd in that tiny tank i recommend you get another tank for those two once oscar start doing that they get aggressive towards anything and will kill anything so yer theres my 2 cents on what i think and have seen i no it probably wont help much but keep your other fish away form those two because they will kill them