I don't recommend live feeders, especially at this point in the tanks cycle. All you're going to do is further foul up the water. Do you know anyone that lives near you that has a well established tank? If so, see if you can get a piece of seeded filter media from them to speed up your cycling process. As far as water changes, I'd do 2-3 small changes a week and make sure you remove as much waste as you can each time. When I feed live, I feed Convict fry I've raised, ghost shrimp and night crawlers.