I usually have two or three levels in my tanks. I have the main level and then I have some plastic containers turned upside down with some of the holes cut out, so that they will have doors to underneath it.. Then I have plastic suction containers, that holds the shells for them to go and check out and change into. I have netting on the back of the tank and then usually have another netting angling through the tank, along with some vines of some sort angling around in the tank for them to move around on. I finally found my coconut fiber last night, after I finished the tank, so I might try to add it a bit at a time, if not, they do fine the way it is on moving on the plastic containers.. lol..
I think I got daughters camera to working, today I will get some batteries and get some pictures of the tank now. If you look in my signature at my Yahoo photos, I have a folder of tanks and it shows different ways that I have set up the tanks in the past.
