The rocks are MarcoRocks. They are truly amazing!! They were recommended by someone here and I jumped on it. www.marcorocks.com
Here is my full review:
The rocks were AMAZING shapes and very porous. The largest rock (which can't really be seen) was like a mothership and must've weighed at least 30 lbs. All the rocks had great texture and shape to them! there are also a bunch of small pieces and rubble to have a nice natural look. Marc's rocks are just as he describes - extremely porous and totally awesome! I am planning to get a 2nd tank at some point and will definitely be stocking Marc's rocks again. My roommate recently ordered some uncured liverock to start his reef tank and when he saw my rocks he was extremely jealous. 100 lbs of base rock is far more than 2x his 50lbs uncured liverock. I would wager that it's more than 3x the amount of rock he received! Marc is also wonderful to deal with.
The bad (for Cdns only!) Shipping to Canada is non-standard for him and there were some glitches. It was not his fault but it did arrive slowly and fedex is just dumb. Not to mention it's expensive!! If you're in the states though..just go for it!!
I appreciate all the commnets! the rock truly does look amazing!! You can't see it but near the back left there's this dome-looking thing that kinda has tons of little pentagonal craters that looked green when I first washed it.. it will look awesome when the water clears I'm sure. As for the caves, there are tons! I tried to stack it up so the fish can easily hide. It's really neat because a fish will swim in the left side and come out the right! Of course, they're only damsels. I don't know that bigger fish could fit/weave through the caves, but I don't think they're into that as much. Also, the caves in the bottom right go all the way to the back.