Jarrod, if the 3 inches of sand you have isn't satisfying your LTA (which is very nice, btw), a small tupperware container that is 5 or 6 inches deep, filled with fine sand would be a good place to locate your LTA. Once the anemone has dug in, you can strategically place some liverock in a way that conceals the container. I had an LTA for years in a wide PVC pipe that was sealed at the bottom. Before I sealed it, the anemone would attach to the bottom of the tank and literally move the PVC pipe. Once I sealed the bottom, the anemone was satisfied and stayed put.