I've done 6 vivariums with clay or combination of clay and foam and really like it. The four 10 gallon verticals in my gallery are all clay backgrounds with hydro balls for the substrate. As John indicated they can become heavy. The others I have done are two 20 longs and one finished 40 vert. I'm currently working on another 40 vert.
The 10 & 20L vivariums are clay only. The 40 verticals I used a combination of foam and clay. Why foam in the 40's you ask! Well I'll tell you. I used the Great Stuff Pond and Stone Foam to foam around the plant peat pots and to make some support locations for the clay. I feel that if you only used clay it would become too high to support itself and collapse. So in the 40 verticals I have foam around the peat pots and any wood I added as well as a few places where it was applied horizontal to provide a shelf for support. The new 40 verticals has much more foam then my first one, but that is because I put in several pieces of wood and one was very heavy, and a lot more plant locations. I have been cutting out excess foam to allow more space for clay.
After you have applied the foam around the pots and any wood you wish to anchor in place. I also use silicone on anything I apply like wood to give it a nice bond to the glass. Foam really just locks it in place and provides more support, you do the standard silicone and peat over the foam. When the silicone is dry it’s time to add the clay. I mix up the clay using something like Special Kitty Litter and distilled or water which chlorine has been removed. When the clay has been thoroughly mix up and is fairly wet I add stuff like coco fiber and sphagnum moss. All the recipes I have seen are for milled moss but that means I need to use the blender and I'm afraid the better half would frown on that. So the moss just goes in right out of the package. The whole thing then gets mixed together and I watch the texture to see that it is not too wet or too dry. If it’s too dry then I add more water so it’s a bit wet. I then let it sit for at least an hour for the water to absorb into the ingredients. If it’s still too wet then I add more kitty litter. Once I'm satisfied with the mix which should be stiff but feel very sticky I press a few handfuls onto the vivarium glass and sit the vivarium up. I do this to see if the clay will stay in place or slid down. If it stays in place I go ahead and applied the batch onto the glass and around the foam if there is any. Press it in good but watch the pressure around any foam as you could dislodge it if not careful. If it slides down then it is not the right consistency. I either add more water if it’s too dry or more clay, coco or moss to soak up more water. Once you work with this stuff you will get a feel for it.
As for the mix ratio I use more clay then coco or moss. I just add the ingredients by feel. There are recipes out there for you to work from.





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