is a sticky to go by to help guide you.
Sororities can be a big headache since you don't know if they will work out. It is easier if you have siblings from a breeder.
Make sure there are a lot of mid-tall plants, making the 10+ gals very dense so the line of sights are broken up, and they can establish territory.
Make sure you are able to house each one individually in case it doesn't work out, or there is a sickness.
You will need at minimum 4-5 girls (which is also the max for a 10 gal).
Be aware that at any time they can become unstable, so keep an eye on them to make sure one isn't being picked on excessively more then others.
Otherwise, good luck!