Well, one of the females ( from the sorority now all out in tubs again) was doing the mating dance. I was feeding them a small amount. She ate one and not the other, then did the wiggle as she went down, and arced and held still. Wow. It was perfect.
And my little boy, I named him luminous but its too long to say, Is now attacking the side of the tub to bonk his sister! They used to be good friends. So I moved them away from each other. What a mess.
'It' says you can start that infusoria by squeezing the water/juice from your aquarium plants. I could try that and squeeze into the aquarium, instead of the lettuce/algae jug.