I put containers with spones in the bottom tray. I always have sponges & water in front of the fan, but I add the bottom sponges when I have a lockdown. 
I have tubing running onto the sponges so I can fill the water without opening the door.
When I run the 'bator and hatcher separately, I keep the temp at about 97-98 degrees. The slightly lower temp helps the humidity stay up. Then, I only have to have the water/sponges by the fan.
ETA: I prefer to use a separate hatcher, but the cabinet hatcher is heavy & would need to be moved down stairs. No matter how careful I am, hatching still makes a mess. It puts all that "down dust" in the 'bator & the shells end up in the bottom under the tray no matter how many layers of shelf liner I put down.
At hatch time, it is easier, but there's more clean-up at the end. I guess it's just a matter of personal preference.
Since I'm only doing a couple batches, I'll just clean it all out when these hatches are over. Normally, I would wait until the end of the season (fall) to take the 'bator outside for cleaning, disinfecting, and some fresh air & sunshine. I just clean the metal trays & egg trays before setting each new batch. (They can go through the dishwasher.)
	
		
			
		
		
	
				
			I have tubing running onto the sponges so I can fill the water without opening the door.
When I run the 'bator and hatcher separately, I keep the temp at about 97-98 degrees. The slightly lower temp helps the humidity stay up. Then, I only have to have the water/sponges by the fan.
ETA: I prefer to use a separate hatcher, but the cabinet hatcher is heavy & would need to be moved down stairs. No matter how careful I am, hatching still makes a mess. It puts all that "down dust" in the 'bator & the shells end up in the bottom under the tray no matter how many layers of shelf liner I put down.
At hatch time, it is easier, but there's more clean-up at the end. I guess it's just a matter of personal preference.
Since I'm only doing a couple batches, I'll just clean it all out when these hatches are over. Normally, I would wait until the end of the season (fall) to take the 'bator outside for cleaning, disinfecting, and some fresh air & sunshine. I just clean the metal trays & egg trays before setting each new batch. (They can go through the dishwasher.)
			
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