Yup jacks are great but need large tanks, Nets or pvc dont work with mine
its quite scary lol.
Butti I love too but.... my butti is a nut job nothing like a jack though, he will also never back down & is hard to clean his tank even grabs pvc pipes when I try push him away but he can be quite calm at times and when actually viewing him else his up to trouble playing with his " toys " he will just eye ball you right back. Still nut jobs though... one time I tested him with other fish and when he could not beat a fronnie in a lip lock he literally started vibrating like a nut job lol.
Now if I put a butti with the jack the same size I have no doubt the jack will shred them within a minute, I am yet to find another fish with the same strength, add the speed and brains on them and quickly you have one amazing fish. I believe you can get them in the states the issue would be timing as there breeding season is over so doubt there will be any juvies for sale.