Well I changed from gravel to sand. I want to use live plants and provide a more natural environment for my fish. I know those aren't live plants in it but I was using them to hopefully help seed the tank. Unfortunately I made the noob mistake of dunking my filter and the decos in the water without treating the water. My other tank is half way done so I'll do seed from it when it finishes. Oh well live and learn. I really like the look of the sand over the gravel. It provides a lot more contrast in the tank.
Edit: Yes that is a piece of gravel it transferred from the gravel tank hiding in the cave.