I have a 75 Gallon tank I got off craigslist that had sand already in it so I'm not really sure what kinds of sand it is. There are small and larger pieces of sand mixed together if that helps. But here's my issue with it. My fish seem to like to sift through the sand and it ends up all over the top of my driftwood, what do you guys with sand do to remove the sand from being on top of the decor in the tank? I've attached a pic showing the sand hope that helps, maybe someone could say what kinds of sand it is from the pic.

