my 180 currently houses a 12' male bocourti, 9" male severum, 7" male fenestratus( who will be rehoused soon, due to aggression) a 9" lima shovelnose, 3 silver dollars 4-7" and a common pleco6". I am considering the purchase of a 12" true parrot. Any thoughts?? the bocourti is king, he never does any harm but chases the others if they get in the way.