Not sure if anyone has tried this, but I came up with a kinda cool way to see my m. Balfouri since it is always hiding. I took a clear glass canter, and took the base pressing it firmly against the side of my tank. This glass was placed on top of a few inches of ecoearth, and I placed another few inches on top of the canter and around it. This helped make the canter dark enough to encourage my M. Balfouri to accept the glass as a hide. This has been successful for a few months now. When I want to get a look I simply shine a light on either end of the canter allowing me to see the tarantula. This has worked with a few of my tarantulas that burrow.