The AntsCanada Ant Forum's

That does seem pretty likely as they have also decided to use that location in the tube to store their garbage and dead. It just seems like a lot of waste for a small colony with just over 20 workers. The size of thew drop is larger than the workers themselves.

I woke up this morning to a weird dark brown liquid trail on the inside of one of the tubes leading from my test tube with the colony to their outworld, can anyone tell me what this is?

The link below leads to the image.
https://drive.google.com/file/d/1P8O--Lux7Zo5vnLraEveJC7CY1rANb7Z/view