Some great new articles from Rob Toonen on substrate depth, particle size, and plenums:
Part 1:
http://www.advancedaquarist.com/2005/6/aafeature
Part 2:
http://www.advancedaquarist.com/2005/7/aafeature
Is this tank pre-drilled (ie "reef ready") ?
What dimensions ?
Is there a center brace on the top, or is it open topped ?