If you want some interesting fish without conflict< try (if you can find em< they are rare) one of these guys.....
1. purple spotted grudgeon
2. marbled goby
3. sleeper goby
the grudgeon is my ABSOLUTE FAVORITE FISH.
He has such a personality, he doesnt bother any fish, but doesnt take any crap either, he will jump out of the water if you wiggle your finger above the tank, he lets me pet him, and somtimes pick him up.
the marbled goby is a charactor, and a ball to watch, he climbs up on top of my tallest plants and perches him self there, hes a picky eater, and wont touch fish food, so i have to drop ghost shirmp in once in a while, which he devours without any restraint. He also likes to nip at the big fish, and actually ate a baby auratus chichlid, hes very slow moving and lazy, but he caught that fish because hes smart, and hes an ambusher. Hes about 3 inches, but can get over a foot....
the sleeper goby is a great fish too, when i sit in front of the tank, hell come out of his hiding spot (he likes to cram himself in my sunken ship)
and come to the edge of the tank to watch me, hell make him self noticed if he thinks im not watching him, and when i feed him, he comes right to the top and scarfs down food....
all very interesting fish, all compatible with yours