If you read the sticky then that is the best info.. 10g+, 4-6 females in a 10 gal. 4 being the very minimum in any tank. You will want very dense planting (real or fake) especially in the middle and upper part of the tank. So tall tall tall plants are a must. And not just at the back of the tank, needs to be dense so back to almost front. You want to have to really look and search for them when looking at the tank. A few hiding places such as a cave or cup are good for those females that prefer them (some will use, some won't.. mine couldn't care less, but my males loves them).
A sorority is always very very delicate and very easily can turn into a disaster. Even the most established of tanks, the best of breeders/keepers will have trouble. Always keep spare tanks (1+ gallons) handy for those girls who decide they don't want to be around others and you will have to keep them separate. You should put them all in at the same time, or in groups of 3 (for a 10 gal, put 3 in, then add in another 2, and etc for larger tanks) otherwise the one or two will establish territory of all the tank and any new ones in will be harassed.
Well, they will all harass each other for a while.. then they *may* settle down.. but at any time something can flare up and you may end up with hurt girls.
So if you are absolutely sure you are ready for it, and are able to house each one separately if needed, then a 10 gal should be minimum and 4-6 girls are required.
Good luck =)