Does anyone know about a reliable, cheap or DIY formicarium that will contain really small ants. I have 9 single queen colonies (will try multiple next year - did not know when I caught and set them up) and am finding workers on my desk frequently. They were in test tube set-ups but got really hard to feed when the numbers of workers grew. I moved them into tube and tub (pencil box) set-ups with fluon on the tubs. The fluon did NOTHING to contain the workers and the tops don't contain the workers either.
I'm looking for formicarium ideas that 1) will contain them and 2) make feeding and hydration easy.
I have read the journals but none seem to go beyond their founding test tubes. The one that did had a dirt formicarium and I'm not interested in going that direction at this time.
Any ideas or suggestions? This is my first experience with ants this small.