I thought it might help them get acquainted through the glass. I moved Perry's bin downstairs to sit next to the females' ten gallon QT. Since the salvinia minima is starting to look poorly, and it would have even less light downstairs, I took all the floaters out of the bin and put them in the cycling tank. And because I had removed so much of Perry's plants, I put into his bin a small reserve sponge filter out of the 45, on a splitter from the same air pump that runs the QT. It was a bit of disruption for Perry, he hid behind the old filter media panel in his bin, so I kept a cardboard panel between the tanks, and left them alone for half the day.
Late afternoon, Perry was acting perky again, coming up to the bin sides looking interested, when a person approached. I slid the cardboard panel out to see how they'd react. They noticed each other right away. The female colored up- red tail and stripes showing! My photos are poor due to the low light and semi-translucent sides of the bin but here's what I got- female: