Even if they all are babies the Oscars will hit a foot by the end of this year so will the Arowana and Jag. They will be stunted possibly in that tank. Upgrade the oscars to a 125 for the pair and upgrade the arowana to a 180 or bigger.there all babies
I hope you can sell the oscars or have another tank for them. They are now weak and the fish know it. Soon they will kill them.