I'd be doing water changes, even small ones daily, and adding prime, and would also add another bottle of biospira. Not only should you not have fish in to cycle a tank, adding that many fish all at once is also not good as your good bacteria need time to adjust to the bio load. In the beginning, it's best to add just a few fish at a time, not 7. Right now, the focus should be getting ammonia and nitrites to 0 Nitrates won't harm the fish