Ouch! That's definitely a problematic FF. It sort of reminds me of the small phoenix in my tank, except she only goes after my HUGE FF.
On the other hand, Pookie doesn't pick on anyone. If the small FF is attacking her, she'll attack back after a while; or if a fish is VERY close to death, she'll ram and suck it to death. But I've never seen her go out of her way to attack another fish.
I'd let your motoro heal up, put a separator in with a brand new FF and one day when you have a bunch of time to spend with your fish, let it free and watch it carefully.
I personally couldn't be in this hobby without at least one FF living in my house somewhere. Pookie rather is like a wife--including no procreation.
