The one thing that causes more headaches than anything for beginning aquarists is the idea of the community aquarium. Just a fine doomed idea like Esperanto . Every type of fish will thrive and live better among only its own kind. They don’t have to always look over their shoulder for a predator. They don’t have to compete for food and they settle down and relax. I haven’t had anything but species only tanks for a long time and I never will try to mix fish ever again. If you like banging your head against a wall and hitting your thumb with the hammer then , by all means , stay after that community tank utopia fantasy. If you want nice fish that act like they are supposed to keep them in separate worlds.