Wish I could help, but I didn't know that WTF's would fight or claim dominance. I've got 3, but they have been raised together since babies. I know they have tiny teeth (feels like sandpaper) on top because my female will try to eat my finger when I'm late with dinner, so is it causing damage to the new one? If no one with fighting frog experience chimes in, I would feed them, then put them together and see how they do. Maybe they will be calmer with a full belly.