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For really small juveniles, like .75-1.5 inch, you can take peat moss in your palm and pinch into it with your thumb and pointer and spin it until it gets tight, and do this until you have a bit of a hut shape, I place this moss hut on top of a few stones at a 30 degree angle so there's an entrance. It works.
I use small terracotta flower pots which I cut in half with my rotary multi tool. I have also used plastic pipe elbows. I got the idea after buying one that had been made to look old & rusty for aquariums.
All my Ts no matter what the size get a piece of cork bark laid on the surface of the substrate and they're left to do their own thing. It's amazing to see what they do with it, yes, some burrow under it but others web to it, some bury it others just sit on top.
I use bark. Upright for the ones that climb and laying flat for the others. This is also good for creating or starting a hole. It looks natural as well and is cheap