For fear of my ants not getting enough water in the open farm setup, I decided to place the nest over a wet paper towel, and periodically put water on the paper towel to bring moisture into the dirt. I thought it was a clever idea until I checked this morning to see that half of the pile of dirt was covered in mold.

The ants discard the parts of the crickets or whatever that they don't plan to eat, and I guess they typically do it in a section of their tunnels. In the case of their current habitat, there's only one dirt section, and it's all rather confined, so they just shoved their scraps to the side.

I cleaned up the mold, added some new dirt, and changed up the tank again a bit. I have a temporary setup right now - I added a small piece of wood that's propped up a bit, and a bunch of the ants carried eggs and larva under it. The queen is currently still in the hotel with another group of ants, but I've moved them off of the wet paper towel. I'll have to think up another way of doing this.

Since the terrarium has a glass bottom, I managed to take a couple of pictures of the ants under the piece of wood I mentioned previously: