I have a new 50 gallon tank. Right now I have 3 white tetras, 2 serpae tetras, 7 neon tetras and a small pleco. I want to add some angels eventually, maybe two? I'll probably increase the neons to 10 or 12 and the other tetras to 5-6 each, eventually. But my question is, what livebearers could I add that would get along with the rest of the population?