oscar and plants

I have a 150 with a 14 inch aro 6 inch Oscar and 2 parrots. I used to have two other blood parrot however my Oscar is the main aggressor in the tank. It used to bully my Arowana and would hip his fins and tear them however my Arowana grew some balls and the Oscar doesn’t try him anymore. My two...

i have an oscar in a 65g with a fluval aquasky and id like to put a pot with a water onion in it. the reason im hesitant to do so is that i moved the oscar into this tank with nothing else in it because i didn't like him picking up largish rocks and rearranging them and i thought he might break...