First off, you need to test the levels properly and list them hear. We don't know what great means.. and if you still have nitrites or not. Just because the ammonia is gone doesn't mean the cycle is over either. You could still have nitrates which means that the cycle is still going on. Also, when your cycle DOES complete, just do a 50% water change and the nitrate levels will drop considerably, which would then be the time that you can add a clean up crew and too add some good algae into your tank which will remove phosphates and nitrates.