We’ve had batches of 10-20 tiny red flashing drones over central va this week

We’ve had batches of  10-20 tiny red flashing drones over central va this week
We did see the large “mothership” off in the distance, while these tiny red drones grid pattern over our land. Yes they are flying predictably like planes/helicopters, but nothing on radar. Additionally, these are actually very small and less than few hundred feet off the ground with virtually no noise. I have almost 20minutes of video from the past week. 
Time: 10:30PM

Location: Richmond, VA