Greg, people love Fiji rock as you said. I'm against the grain by saying that Caribbean rock is amazing, but was harder to find. Saltwater fish.com was where I got mine, but I think reefrock2go or whatever reefs2go's new site for rock is also has it. This stuff was formed mostly from lettuce coral if I remember correctly. The large pieces are full of small to large holes and the broken chunks are long, wide, and thinner making them perfect IMO. Big guys for the base and the chunks make perfect bridges, caves, and crevices. My 2 tanks is filled with this stuff for reference.