Possibly Necturus, the diagrams I have of nests are upto 4m deep, but they are fairly old, so I wouldnt be suprised if there are larger ones, fascinating things they are! amazingly well orangized and constructed
the tank in the link is bigger than it seems, the nesting area is 36x36x40cm, which is ok for a while, but yep they will grow fast, although you can control the growth some, it makes more sense to me to get a tank big enough to hold them for at least a few years, the main issue I have with the setup on that link is the Soil & water tank size, the ants will invariably dump the soil into the water as the fungus grows, along with all their waste, this is going to make the water very messy very quickly, so really it needs to be a much bigger tank, with a good filter, and plenty of space so that the nesting tank can be moved around occasionaly to give it a good clean
for a rough guide, we setup one for a school, similar to this setup, but the water tank was 180cm x 60 x 60 (or somthing simlar) the nest tank 60x40x40, it has a large external filter & 2 300w heaters, the tank has been setup for about 2 years now I think, and its teaming with ants! (Acro) I wuld estimate that unless they control the growth, they will need a new setup with 2 years, maybe less
heres another way you could do it, using lots of small, what look like plastic tubs...
original link...
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