I quite for a while! I got some "Ultra Reef" fresh water sand..... $10.00 worth which is 10 lbs. I follow directions as in soaking it and stuff...... This stuff SUCKS!!!!! Most of it ended up on the bottom so I had to mix gravel and sand on the "beach". I am very aggravated. So here is what I ended up with and this is how it will stay for a WHILE! (the cloudyness will subside in a while)