Betta Fish: Someone’s getting real horny…

After a 60% water change last Sunday, I realized one minute too late that the water was colder than expected (my fault). In fact I was slightly worried about him but the heater would get the temp back to normal in two hours, so I walked away…

Well, it seems that monsoon season is here, and he started to build his first bubble next this morning (so excited)

As I deployed this tank specifically aimed to see a Betta breeding once. Any advices on introducing a female?

Already learned the ropes and did the study work , but looking for advice from the community here. Attaching a current look from the tank.

Thanks!!!