I found some styrofoam at work and cut it to fit the bottom of the window sill trays that I am using for the Mexican pings. The pots are too short to fit to touch bottom so I had them supporting each other. But the styrofoam gives them something to rest upon instead of each other. I can also have water in the tray for evaporation / humidity, while keeping the soil media almost dry, while they go through the next 6 months in winter mode. No camera / no pictures for now.