I'm about to create my first Formicaria/Outworld combo. I plan on using an all acrylic 5x7x1 photo box and pour a grout/perlite mixture into that. Before had I’m doing to be using some always wet modeling clay to sculpt my tunnels out. In the formicarium, has anyone added a Rock, or perhaps a stick/wood to them? I’d like to put a stick going across one of the larger cavities to add something different, almost like they dug around a root.
Also, with going the Grout/Perlite mixture. Will it be too fragile to make small arches about the thickness of a pencil? If so, what would be a good material to reinforce it? I was thinking Metal wiring, but would that eventually start to rust and work it’s way into the water supply?