I have them in a stock 14g biocube, on a piece of lr. Its about 2 to 3 inches off my sand bed. I just noticed the yellow today, after it got knocked over off the rock onto the sand by a hermit. I'm not sure how long it was upside down in the sand but it wasn't more that a couple of hours. Also I will sometimes notice the "buds" of the gsp protruding a little.