They prefer very soft, acidic water. Mollies and Angels can live together, but other livebearers such as platies and swordtails will work better with Angelfish. I once kept four Mollies in a tank especially suited to the needs of Angels, but I added aquarium salt for the Mollies.The poor mollies didn't do well.You can keep them together, but not in a tank especially tailored for one species or the other. As for temperament, they work beautifully. once kept four Mollies in a tank especially suited to the needs of Angels, but I added aquarium salt for the Mollies. The poor mollies didn't do well. You can keep them together, but not in a tank especially tailored for one species or the other.