Yeah u really need to let the tank settle down before adding any more fish for the fishes sake and your bank balance because that many fish in that small tank is going to be stressing the fish so much they will want a cigerette lol I had the same size tank when I started out and admitidly I over stocked mine too but I kept on top of the maintenance. And I let it cycle properly. Don't get disheartend by any mistakes u make just learn from them we all start somewhere and we are all always learning hope you can get it sorted out so you can have a nice relaxing tank to watch