Banded Leporinus keepers, please step in.

[quikv6]

Mods, please feel free to move this if necessary. There's a broad tips-n-tricks aspect, which is why I put it here.

Looking to hear from anyone who has successfully kept adult Lep Fasciatus in a community environment.

If anyone has, are there any overall tips and tricks that surpressed the infamous reputation they have as pestering nippers all the way to kill-for-sport species.

 

[Deadeye]

Unfortunately there isn’t a lot of great info on this species.
Groups supposedly help.
Mine had been living somewhat peacefully in a 125 with some cichlids for 2.5 years, but this past week decided he didn’t like the convict or Jack Dempsey anymore…
He’s still with a severum and rainbow cichlid that he tolerates (for now).
I picked up 2 more juvie fasciatus to see if it calms him down in the future.
One thing that I’ve noticed is that mine rarely, if ever, attacks fish significantly smaller than itself (as long as they’re not so small as to get eaten) - larger bodied tetras are a good option. Most aggression that I’ve noticed has either been territorial or dominance based - very similar to cichlids in that regard.

 

[quikv6]

Thanks Deadeye ....I was hoping you'd chime in.

I have been caring for a lone Lep at an old workplace for the last 5-6 years. He is 13 years old, and in a 75 gal. (Wehn I discovered him, he was in a 46 bowfront, and severely neglected.) Anyways...his overal health, and what is best for him is my #1 priority. I can't stress that enough. Given that...what would you do here:

Context: I am getting a large tank built, and will be transferring the fish in my 240 to the new tank. (roughly 450g.) I would love to give that Lep a chance to have room to swim, and more stimuli. Risky, in many ways:

-He's old. I really don't want to stress him by moving.
-He is alone. Introducing him to tankmates (SA Cichlids, Bala, Flagtail, etc) could stress him more.
-He can also kill my entire tank....like he did to his a decade ago.

Honestly, what would you do? (knowing his health is my #1 priority)