Anybody do/done this? I've got plain PFS in there now and it looks pretty cool but at the same time the sand is really plain, as if my tank is a beach, or a desert. I have 50lbs or so of medium brown gravel and some larger (2" or so) flat river rocks and I was wondering if anybody has mixed rock and sand, and how it looks (pics would help). I'm thinking the rock will give a little more dimension to the sand but I don't want to throw in the rock and have it look crappy, and then be trying to sift the rock out of the sand. Also if anyone did this did you just mix it all together or put the rock on top or whatever.