It is stacked one above the other. The whirl in the middle was part of the lowest colony where the big empty space is near the left, it grew within 3" of the glass and I accidentally fragged it when cleaning. I wanted to frag off a big piece like that, but honestly I didn't have the nerve to, so it worked out for the best. The one at the very top was just a sliver of a frag that broke off the main colony in transporting it home. It's amazing how fast these grow.
That orange colony is awesome.. 16"! I wish I had the room to let something grow out like that, my tank is only 19" deep.