Test tube ant-farm V1

Here are photos of a test tube ant-farm I use instead of concrete or plaster artificial nest.
It is used since last year, so it is viable.
the aim is to get a low maintenance ant-farm, test tubes providing moisture for months. test tubes can be removed provinding access to brood if needed. Designed for 20ml test tubes (16,3mm x 150mm).
I'm still improving this thing, and a v2 update is already available and will be uploaded.