yes sand is fine. i grow my tank in my signature with regular sand. all u need to do is fill a bucket up about half way with sand, and take the hose and fill it with water, preferably outside, and keep swirling the sand around and dumping the silt and dirty water out, over and over untill you can tell the sand is settling without any silt (dirty water) constantly floating. just dump out the stuff that floating and eventually ur sand will pretty much stay on the bottom, and ur water will run clear. its really easy, and sand is great for fish too!!