don't know if this is right......
male: part yellow face,and a yellow tail.
female: completly blue.
male will clear a rock ready for spawning.
that's just what i found,hope fully someone else will
pop in here to help.
if possible pictures of your fish would be nice,because
if this infromation is correct,it may help someone else
with these fish.
if i'm wrong...then sorry. :)