I use empty pots that the 1 gal plants come in from the nursery, and fill it half way with sand, and leave it at the floor of their cage with a vine running in. It is small enough to fit in the cage, and large enough for her to crawl in and start digging. When I get home every day I check to see if the sand has been disturbed, If so... I use a 5 gal plastic pale with the laying medium filling half, and I actually put it right in the cage... Most cages can fit one of these in there if you remove a plant or two. This way I don't have to move the lady, and she leggo her eggos at her own leisure. Just make sure you keep the laying medium damp enough to hold a tunnel... I almost lost one of my veiled girls, Caddie, to a cave in while she was covering her eggs.