stack it up like a jigsaw puzzle. Each piece will fit just right, after hours of moving each piece
![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
It will drive you nuts trust me. Just go piece by piece until it looks perfect. Big pieces on bottom for base and smaller up top to make tunnels and things for current and coral placement. Good luck, hopefully you wont look like this when your done <img src="graemlins//urrr.gif" border="0" alt="[urrr]" />