If the tank is cycled adding will not hurt. The water will clear in day or so. Just watch the perimeters.
Your tank ISN'T cycle yet, cycle a new tank need weeks, your water temp is fine. No offense but seem like you are new to this hobby, don't panic keep reading and search around this forum will give you handful information to get you through almost everythingIts been cycled for about 5 or 6 days. Heat is at 78.5 too hot?