When his mouth geometry changes markedly (it's so obvious - here's photo of him with babies showing and the female on her own), you're not far away from babies. I wasn't looking for them. It just happened while I was cleaning up. Then I started to study the male's behaviour. Not eating but mouth wide open to let morsels in for the babies (guessing here). He let 3 go then another 4 the next night, then another 2 around 7 hours later. There was another still in his mouth but that one disappeared. I have 9 total growing fast.
1st photo is male with babies. 2nd is female. As soon as all fry were gone, his mouth became very similar to the female, except for a small "double chin". His body size is slightly smaller than the female's. I also took note of his dot pattern.