I've been using Tropic Eden sand in my tank for the past couple of years. It is super clean stuff and looks great, which works nicely for those that need to add more sand from time to time to an existing reef. I wrote up an article about just that: http://www.reefaddicts.com/content.p...ting-reef-tank So when it was time to get more sand for the new 400g, I didn't hesitate to order more. I like Tonga Reeflake because it doesn't blow around in the flow ...