I have had great success with KP Aquatics. I need to order another 70 pounds today/tomorrow but was looking at Tampa Bay Saltwater as they have rubble that I can include. I have also heard great feedback about TBS. But, I just got an ad (Thank you Google for listening to our conversation) for US Live Rock and they are a lot cheaper. However, I would hate to buy Petco purple primer rock that someone let get slimmy... Does anyone have any experience with US Live Rock?