My tank is ready to receive substrate but i'm not sure what to get. I had planned on live sand, but the South Pacific live sand I was going to get did not contain crushed coral. I then heard of Arag-alive. This would help stabalize my pH and introduce calcium, but I don't think I'll be getting the worms and crustaceans and all the life that is in live sand. Which would be the better choice? Also, would I be able to mix them or would that just look weird? any opinions appreciated. thanks!