Originally Posted by Dogstar
Fiji premeum is what most people use as their main rock. Its great rock.
Tonga has big branching shapes ( dead encrusted staghorn ) and Buna has smaller branching shapes. Many use these for added decoration because of the shapes.
On the subject of Tonga.. I paid $200 for a 16lb piece that was completely hollow. It was a bunch of branches stuck together on the top and the bottom with nothing in the middle, but from the outside it looks like a solid piece of rock with a bunch of holes. It's so massive and hollow that I now have 3 flame scallops resting inside of it and there is still room enough for all 3 of my chromis to swim through it. It's GREAT! It's going to be the centerpiece.
If you can afford tonga, go for it. At least one or two pieces looks really good.