That face, :O haha.
Get a 50 watt heater at least. Stays warm in my place though, you might need a 100 watt but for sure a heater is necessary for them to grow quick. You should keep the tank around 80 degrees. Also I would go bare bottom unless you want to do some live plants. Vallisneria/apongenton/anubias/hornwort grows easily and is basically impossible to kill. I would also slap a cheap led light on there or a home depot clip light for plants and algae to grow, they should munch algae.
The aggression might go down a little but if she is like my females she will lay again in 2 weeks or so so be prepared. i would feed some to your other fish. You could be overrun in a short time haha.