Have you actually studied those particular killifish? Not for beginners, recommended as species tank fish, multiple males will fight, Fight with other cichlids, don't put with slow moving fish with flowing fins, hard to get. You're also trying to make a community tank out of fish that don't belong together. Yes some mixing can be and is done but you have water types from all over the world and will not be sustainable long term without an inordinate amount of work. I know you will do it anyway so good luck and keep learning.