I've just set up a second aquarium and I'm using beach sand that I collected myself as the substrate for my freshwater tank. This will be an extra guppy tank for me. Has anyone else used beach sand? If they have did they have any problems with it? I washed this sand really, really good and I've had the tank set up for about a week now and just added two of my zebra danios as test fish. So far they are doing great and the water is testing good. I just wanted to check to see if there are problems with beach sand that I may not know about. I've used creek gravel before that I've collected around my house but since we live out in the boonies I would think that is much more free of impurities than beach sand. I will try and get a photo of it soon.