My Diamond Tail pair. Both was just over and under 1 inch in Feb of this year. Now the male is about 2.5 inches and the female pushing 2 inches. They spawned regularly. The male in full display, full of colors and fins, swimming around and around her. Both dart up the water about 6-10 inches then dive down. I have not see them release eggs and sperms yet, but that activity cannot be anything but spawn ritual.
The male started to change sex as soon as a larger male was removed from QT (went to a friend of mine). The dorsal ray elongated within a few days of removal of the larger male. He was only about 1.25 inch at the time. He is able to suppressed sex change of the female in my aquarium of 320 gal since 2/2020.
Here are a few pictures today. They swim very fast and it is hard to take good pictures.
I love your photos! I also need a 300g cuz I need more wrasse in my life