ant nest founding test tube holder
thingiverse
I'm setting up my ant founding test tube nest, which fits perfectly in this tank https://www.walmart.com/ip/Aqua-Culture-Betta-View-Half-Gallon-Fish-Tank-with-Base/17248150. I've drilled a hole so you can fill the bottom with soil if desired or simply place it on the aquarium floor. I cut some screen and glued it to the lid to keep the little critters inside the test tube. The tubes themselves measure 20mm x 150mm, available at https://www.amazon.com/Glass-Tubes-Rubber-Stoppers-150mm/dp/B07C76KNMF/ref=sr_1_3?dchild=1&keywords=20mm+test+tube&qid=1588002499&s=industrial&sr=1-3.
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