The wire wrapped around the thin plastic hose to hold it in place, was supported by the cage.
To control the amount of ‘dripage’ I had a sliver of wood rammed into the black nozzle in the end of the hose. Not a particularly fine system for efficiency & reliability. The holes drilled in any or all containers need to be a certain size which prevents the sand from continually washing through and causing disasters.
Later on experiments were made using pieces of cotton to lay the cage/container on top of, with minimal results as the water flow was hindered somewhat.
The final design is a double layer of paper towel laid beneath the container housing the insect in question and satisfactory results have been achieved, with barely any sand being displaced as long as the surface is flat and the outer rim of the first tray touches down securely.