Since december I've had 1 male and 2 females living in a 2g tank peacefully and I've been looking to upgrade them to a larger tank and yesterday there was a 5G tank on sale so I bought it and now I've moved them into the 5G tank. I've lucked out with these 3 getting along, but I also think it may be because I use an air stone in the tank because then the male doesn't make his bubblenest and then the females don't lay their eggs in it and all get along, but I'll be keeping my eye on them in the new tank and if any problems occur I have the 2 G and a 1G vase if I need to seperate them.