OK, so it is true, the more you read the more confusing it gets. I have Mallard eggs in a Hovabator forced air on day 29. I have been following the instructions to the letter such as fill tray X when, tray Y when, do this, stop that when etc. And then there is BYC who I trust sooooo much more than any instruction sheet or general hatchery advice. I read everything from add a wet sponge or your chicks will shrink wrap to keep the humidity down or the chicks will drown in the shell. These are eggs from my ducks so any failure to hatch will be my fault alone, not shipping etc. I have no pips yet and I know I shouldn't worry. (yet), but I would really like to know, ... sponge ? pull the plugs ? Put them back ? At the moment I have both plugs pulled to keep water from forming on the windows and both trays filled. The temp is stable at 98.75. I have no way to monitor the humidity.