Come out with the PICS! If you are asking how much sand in the fuge I would suggest 6 inches. As for the bare bottom, It's just like Yote said. Depending on your flow, you could end up with detritus all over the bottom which will look bad. Just check out the stock tanks at your LFS next time you are there. I have never seen one that doesn't have something on it, whereas with sand you dont notice it as much. Even when it's dirty sand just looks more natural.