dovii , hands down , not even close. I had a 15" male,super aggessive and sneaky, had to water change tank with net in one hand sihpon in over plus pay good attention. It was like he knew when i wasn't and timed his assault. Other times he would be very shy, I remember adding the biggest bone white red devil male i had ever seen , as big as my chest, he dwarfed my dovii and I remember being scared for "Claude", but I left the room for 10 min came back and Claude had strip mined all the scales on both sides of the red devil , All of the scales, All of them on the flanks of the fish. No lip locking, no tail wagging, no dominance displays, Just the biggest sized ,Monster red devil by far I have ever seen and I've seen alot going down , with its last couple breaths. I couldn't believe it. needless to say no more attempts at tank mates. I miss that fish and wan't another. I have two , but they don't have any where near the color and dominant look and finnage.