I currently have 5 Jordanella floridae in a 20 gallon long. 2 of them are males. I've noticed that all of them have nipped dorsal fins now, except for the large male and a shy female. I'm sure that I can make it work if I just have a male/female pair. But, I'd rather have a small group of them in there. Would a group of 4-5 females coexist without much aggression?