I had the absolute privilege last night to go see the most beautiful reef tank here in Iowa. This guy has a 210 gallon sps/lps tank in his house. Stoneynut would have a hay day at this guys tank. the reason for posting this was, he did not have a substrate, he used a thin grating on the base, no substrate.....so I guess it really is a matter of opinion and maintnence.. :notsure: