I have read that a 75 gallon tank is enough for a wolf fish, and I was wondering if I kept up with my water changes, and made sure both are well fed if I could keep a wolf fish with my existing 10" oscar. I have good filtration.
Ur right it's all about temperment as mentioned. If it's smaller it will be less likely to attack the Oscar. But being smaller makes it less likely to go after a bigger Oscar. Can try and keep a divider ready. Get a bunch of dithers as an alternative plan.