That tank had changed drastically. Those pics are from June 2010 and by October 2010 he no longer has the volcano look.
Now he has an above the water line lagoon and it looks good with all the life in it. He calls it the Basin Tank now. I wonder how high maintenance it is, mainly how hard it is to maintain everything located in the middle overflow that is hidden by the Basin.
I wish I had the room, I would build one of those in a heartbeat. Make is a 360 walk around and not up against a wall. A high ceiling is a must.
Volcano/Basin Tank
He still has pics and vids up on the Volcano Tank as well as the Basin Tank. Those crabs are awesome that run around in and out of the water.