A bigger tank sure can't hurt. Mine are in a 180 with a pair of Panamense and a pair or Theraps Coeruleus and they are doing well in that set up. Not the most voracious of eaters but they are happy.
Nolagt, your Ornatum look great.... love the pics and vid. They do look alot like Festae when barred up but I guess thats why they are in the same family. Keep those updates coming and lets see more of the bigger fellas (videos)