30-gal. tank with 15-lbs rock = no bueno so we bought 11 more pounds with some 'shrooms attached. They are green and look like broccoli. We ended up getting a tiny star fish (about 1/4" in diameter) and some worms in the process. Before: After: We also bought a peppermint shrimp but I'm guessing we'll need a wrasses to take care of the worms.