Reefers: I know you're all live reefers but I'd like to share with you. I got a large artificial reef from a company named Instant Reef. I followed their instructions before adding it to my tank. However, the next morning most of my fish were dead or dying. My lfs also tested the coral for me and got the same result...nitrites off the chart. If anyone knows of anybody else having similar problems please let me know. Thanks.