Let see, I had one tank a while back that included:
Red Devil
Oscar
2 Convicts
Green Terror
Black and White Skirt Tetra- these two were thrown in by my brother when he wanted to change up his tank and they adapted. I always thought it was very interesting because they basically turned aggressive, and by this I mean they actually chased off the oscar and green terror. It always blew my mind
Another tank, has:
ZZ Flowerhorn
Red Devil
2 Jags
Green Texas
Red Tiger Botia-I think he is the oddball out of this group, had him about 4 years now and he's always maneuvering between cave formations so thats how I think he's safe.
Also one other tank has a Jewel with a Yoyo Loach and they seem to be buddies haha