The Female.

I guess it's possible for the female to lay her eggs without a male around.

The one that was swollen and aggressive got over into the corner and frantically moved rocks so that it created a ramp-like thing. Then she stayed in the corner and swam frantically, I assume feeling the movement of the water of the corner of the tank like what the male would normally do swimming next to her and she laid her eggs on the created embankment, turned and scooped them up.

She took a break or two to chase the other fish away and then continued with laying her eggs and scooping them up. She's been tumbling them since Sunday night. I guess she'll probably drop them in a day or so, as they're not fertilized.

They better not be fertilized. If they are, then that would mean that either Baby #2 or Baby #3 is a male displaying female colors.