I'm interested in setting up a large amazon themed tank and have seen some awesome pictures of sandy substrate that looks really good with driftwood. I've never used anything but gravel. I'm wondering how you clean a tank with sand because it seems to me that it would all get siphoned out when doing water changes. Obviously it works some how because a lot of saltwater tanks are sand.... How would you clean a tank like I want? Is it more trouble than its worth?? Thanks.