Yes, I definitely don’t want to keep them like this for long and have problems with fry predation and crowding. I have a separate empty 5 gallon for one of the pairs, it’s not set up because I didn’t expect them to turn into adults this fast.
I will leave the dominant pair in the current tank and put the extra pair in the new tank.
I did see the dominant female bullying the weaker female. Noticing lots of chasing and aggression, so it will be good to separate the other pair soon.