I've kept seven doviis in the past.
Got my first batch of two at 2". Luckily, I had a pair, and they bred in my community 240.
Funnily, it was the female that was by far the more vicious than the male. They bit and attack the other fish, but did not actually kill any (giant gorami, black belt, red terror etc).
After four years, the male was 18", female 9". I made the mistake of introducing a jardini. The doviis were breeding at the time and held their own. I took the fries out, and they became more docile. The jardini killed them both after a while, along with everything in the tank. To this day, I regret losing those doviis more than any other fish
I bought another batch of five at 2 " as well a couple of years ago. Grew them out until about 5", kept the nicest male, and gave the rest to friends. Recently, that male at 14" was killed by a butti.
The only fish these doviis ever killed in my care was when the second male killed a 10" flowerhorn. Except during breeding, the doviis I have kept have never been as vicious as some of the stories I've heard. They're magnificent fish, my favourite cichlids. Trying to find more at the moment.