I'll post more pics and explain the terrarium. Layout. It's a 2 feet by 2 feet. Wide. And a bit more than 1 feet tall. Here is a bird eye view pic.
The center has a bonsai tree. I also put a container in the middle in which the tree stands on. It limits the space to dig, and compacts the coconut fiber for better stability. Anyways I have seen these ants come out from 1 inch of coconut fiber. So I'm not to worry about collapsing tunels. They will be alright. They are strong.
This is the foundation of the terrarium. It has 2 large nest you can seen it on the side. Those white triangles. I also used a k23 fire brink on the middle, and bury it. They already discover it and moved into.
This is the right side nest. I have both entrances plugged for now. Colony is not large enough. I expect there are around 2000 workers. 1000s died during the winter.
This is their main nest. As you can see the whole bottom of the terrarium. Has broken red fire brick. Which absorbs water. Also I have placed around 4 tubes which reach the fire brick ground. Which I use to drop water.
I Hope they do not make a mess. But looks like they will. They are bringing tons of dirt from under ground. They must have lots of caves by now. Due to amount they moved out. So far I see no collapse. As clean up crew I have 100000s of spring tales. They live inside the nest, and among the fire bricks. They come out to eat all the time to the top. Not worried at all by mold. My only worry is they might store all their dead workers in underground chambers. So far I have seen them bring up 2 dead workers. I wish I could introduce larger creatures to eat their waste. Problem is this species are aggressive.