I do love a nice sandbed and and rockin fuge. when I set up my 180 I was told by my mentor to go bare bottom for 3 months and I did. The things that get in your sump and on your aquarium floor was enough for me to not use any sand. Po4 tests are always not detected on my testing equipment, I'm sure there are some. My nitrates, are awesome corals are growing faster. I know people keep successful tanks with sand beds and respect the fact that its a choice, I'm not saying one is better than the other. I'm only saying I've had better success personally going this route and yeah,I'm jonsin for a sandbed...maybe set my cube up with a nice sand bad? ;p