The differences can be very subtle. Like the blue on the lower jaw. See how the male has none and yours has smudgy blue? This isn’t always a definite way of sexing, but it can help.
In this case you can see the males business, so that makes it easier.
Females only have their tubes down when getting ready to spawn. And their tubes are rounded or flattish looking. Not pointed like the males.
Very nice! I’d love to have a 200g+ tank. Right now I’m lacking the space for a tank that size. Share pictures when you get it!