ant nest founding test tube holder
thingiverse
this is my ant founding test tube nest which fits this tank https://www.walmart.com/ip/Aqua-Culture-Betta-View-Half-Gallon-Fish-Tank-with-Base/17248150 ive added a hole so you can fill the bottom with soil if you would like, or just place it on the bottom of the aquarium. cut some screen and glue to the lid to keep the little buggers in the thing test tubes are 20mm x 150mm 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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