haha I am using sand, I have a new tank same size that I am moving them into because its shaped nicely and has a dresser made for it that is really nice. I have crushed coral and stones as my bedding and it works well no problems. I use my reverse osmosis for the water, not regular tap water. Back to the sand topic, make sure yourinse it well, make sure the water is totally clear before putting it in. I rinsed my sand quarter filled in the bucket, rinsed each round about 7 or 8 times, the water was a litter clearer but still really cloudy and i could barely see my fingers in the water... and I was like what is going on? so I read the bag that it came in and it said it is loose sediment, so I was like oh, then I just have to wait for it to settle. I cleansed each round 7 or 8 times, put it all in the tank even though the water wasn't very clear before draining it out. Now I have been spending two days clearing out my cloudy aquarium.!! hahah. slowly but surely it is clearing up, I am guessing another 24 hours and it will finally be clear. I have been rinsing my filter cartridges and wiping off my filter... Your filter will get clogged where it pulls the water in before it filters it.. you just have to wipe it off. So really just really rinse that sand off make sure this doesn't happen to you. lol