How many Bettas in a 55 w/ my neons? - I own a 55 gallon tank with 30+ neon tetra. I was wondering if I could put 2 or more bettas in the tank. Does gender matter? Because I heard 2 males will fight to the death. Would it be different with 2 females or 1 male and 1 female? Or maybe even 3 females 1 male? Thx!