I have 3 big electric dempseys in with my polys, they ignore each other, I also am feeding massivore because when you feed live I think they nip fish more but that is just what I personally think. Severums make great tankmates too, they are pretty chill and take up the middle tank making it look like you have fish. lol I had climbing perch and african leaf fish for a long time and tried to do a biotopic tank, but I wanted more color and ebjd was a perfect match, I raised them up in a 55 and now they are in with my polys all are 4-6in, I prob have a photo thread on them you could check out. I also have plants in too anubias on driftwood is great becuase it is hardy and bichirs love it.
I'll find it and post a link of my tank for ya peewee. A butti that size would be ok, but they get really big and pretty mean, and although they look cool now the yellow stripes kind of fade and they don't look as nice when they grow up.