it's unusual not to find any eggs if I were in a similar situation I would separate the males from females for a week or two reshuffle males so they're not put back with the original female ,by changing male and females can make a big difference to them spawning
@fish48 Funny you should mention that about reshuffling the males. I thought of that. My three females are all very different in their individual personalities. One is shy and retiring , one is kind of a shrew toward her mate while the third is a party girl. The males not so different but one is a lothario while the other two are pretty casual in demeanor. That's a good idea , mix them up. Change the dynamic.