3 3/4" is about as small as I would go and still use grow rocks. You can use the 2" net pots but to use them correctly you need rubber plugs to hold the plant in the center of the net pot and no grow rocks. The roots get all the room (what little there is left) in the net pots. Those do need to be feed from the underside more like an Aeroponics system or a fog system. You can't feed from the top when you use the 2" net pots with plugs there is no room.

Did that help you dude?