My tank is 60 gallons, which I think is adequate to hold one tang, but as you saw from last month's TOTM, that doesn't always happen.
That man had a regal angel, and two tangs in a 65 gallong tank. Incredible, but he pulled it off.
Time will tell if this stuff holds up to the test. They have been using this stuff in Europe for years and I think a new trend should be started in America. It will take probably 6 months to a year to get this stuff looking more like liverock.
Peace,
John H.