more dominant will be the female. but once a female always a female. But any male can sex change into a female. Usually the smaller one will be male and will always be smaller.
"reefing sure takes up your money...but it is the best money ive ever spent!"
Last year I had a tomato clown in my 60tall that would chase anything in the tank, even chase my Lionfish until it would hide in the rocks. Then one day I think the Lionfish had enough of his little orange crap and killed him but did not eat him. A mercy killing.
My current false perculas are nice , but have to be the dumbest fish ever made. Put the green fish net into the tank- he swims into it. 1 good brain cell if he's lucky ! haha