Hi Litfish
Sexing this species is a fairly common question. There are no hard and fast rules. But some that are a better indicator than others. By all means go though all the old posts to confirm what I say. Sorry I can’t give you a simple link to give you a short answer.
You will just have to read my dribble ?
Females have light blue dots on the black circle mid week body. Males do not.

The pink stomach is a female sign as is the lack of a large comb on the top fin.

A male with a long top fin but not all have this. Note the black dot.
I have added two fish multiple times trying to get a pair. Often they make do with each other’s company without killing each other even when they don’t breed. If you see a fish hiding in plain site facing the corner for hours on end it will die if you don’t remove it. Stress is a killer. You should have anoth tank before attempting to make a bonded pair. Or just be aware one is going to die if it doesn’t work out or you can’t return.
i know of no special things you can do other than provide the
sand, leaf litter , a flat rock and the warm water essential for these guys. Live food will help them breed but my experience suggests you can’t MAKE a pair if they don’t LIKE each other.
To answer your question.
My vote is that’s a male.
The German strain has much longer fins and better colours. But if the Americans what to call them all German blues who am I to question their choice of names.

This guy has some German blood , note the length of his fins