Well I have also grown out several Dovii but to me the first one looks like a male it's has an alot of blue for a female and it seems that the bars are going away. Then the second one looks like a female less blue coloring and has the harverticale body lines, correct me if i'm wrong but I dont think so.
Got the male and put him in the tank with the girls. He seems to like one over the other, but still checks the other one out. At first he was chased all around, but now he holds his ground. It now looks like the girls are fighting each other and lets him do whatever. He actually swims next to both girls and rubs against them. When do I know that a pair is formed and when do I take the other girl out. Do I wait until they actually spawn? Sorry about the pics, they are dark.