That is also what I have in a couple of my tanks. It was labeled play sand in the Home Depot store. It only costs a couple dollars for a huge bag, and so far I have been satisfied with it. If you use play sand, you must rinse and rinse and rinse some more to get all the dust particles out. Otherwise, you will have cloudy water in your tank. I used a 5 gal
. bucket and added small amts of sand and just kept rinsing it, swishing water through it until it ran clear. Then did the next "batch". It took me a couple hours to do sand for a 55 gal
tank but my water was never cloudy so it was worth it! Also watch out if the sand is too deep you can get anerobic spots, maybe with lots of plants wouldnt be a problem. I keep my sand only 1" thick and stir it a bit when I vacumm. And I made the mistake off putting a large fish who liked to blow mouthfuls of sand out into the water column. Even with my power filter intake halfway up the tank, it was drawing in sand which made a lot of noise and wears out the impeller. So in this tank it was back to gravel again. It does look nice though, and also easy to keep clean as the waste stays on top, and the fish food that hits the bottom doesnt fall between the gravel and rot.