I will share a few experiences and opinions.
First, in my opinion if you have two it should be male female. These fish have a strong pair bond once established. I have seen a healthy male stand guard over his sick female, and visa versa. When they spawn they work together. It is pretty cool to watch
Second, they will establish a hierarchy. If you have all males you won’t see their best color and the battles are sharper. Male female will fight as well. She will test him to ensure he is strong enough
Third, a male, female does not ensure a pair bond but you will see the flirting
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