I had a question about this so I'll post it here, we have now played 20 pro games this season. So anyone who is farm eligible and has 20 games played at the pro level would now be subject to waivers if you send them down. You can read more details in the rulebook but essentially once a player has played the 20 pro games waivers becomes a requirement for them. For all your pro locked players this is irrevelevant. If you bring up a farm guy for an injury fill in he can pass freely until he has accumulated 20 games at the pro level.
Keep your eyes open when making your roster moves.