I'm working on some new 10 gallon vivariums using the clay/kitty litter backgrounds. I want to see how well this works, how well it will stand up and how much maintenance it really needs.

The one thing I do suspect is that the clay backgrounds probably can't be used for higher backgrounds without having a very thick base. Just like in building construction that was based on stone the bases were very thick in order to achieve great hight. Just look at all those old Cathedrals and you will see what I mean.

Now maybe one could glue horizontal bracing onto the glass at various heights to support each layer above it thus achieving a thinner background that won't sag downward.

When I talk about a thinner background I don't mean really thin but the right balance of clay to support both the clay above it, plant growth and moister retention.

Currently I am gathering components for a vertical 40 Gallon Breeder tank and I suspect it might be a combination of foam and clay to obtain the look I want.