I had 180g tank when I first started keeping fish.
I had a red devil, buttikoferi, dovii, jaguar, festae, and trimac in the 180g. They all were about 1.5 inches when I got them. After 8 months of keeping them, the buttikoferi went rampage destroyed/killed the trimac and festae. Then the jaguar got killed by the dovii. Then the red devil got killed from the buttikoferi. I was an idiot when I started, but you eventually learn lol. All the deaths happened in the morning(which they got killed the night before). They usually let you know though, they'll start chasing relentlessly and flaring at you.
Surprisingly from all the stories I've heard about dovii's mine got massacred by the buttikoferi, even though the dovii was bigger by 4 inches. The butti was the last one. I got rid of him before he got rid of me. I swear he was going to break the glass from attacking me.