To be honest, IMO, I think your biggest concern here is not whether or not the girls will get along, but whether or not suddenly adding so many fish to your tank will cause a spike. I know you have live plants but it can be difficult to tell.
I honestly think the girls will be fine. If anything, regarding the tank itself, I'd add some more broad leafed plants or throw in some silk plants until the live ones really fill in. But they will likely be just fine. You'll see some nips and chasing and flaring and slapping (or you won't) but they'll figure that out on their own, usually. They are counting on you to make sure that there aren't any spikes.