I'm new to it too. I have had live rock for 2 weeks and bought a piece with blue mushrooms on yesterday. It is absolutely awesome!! It's teeming with life! I have got 5 feather duster worms, 9!!! brittle starfish, tons of crawlies, something that looks like a bristle starfish but unbristly and orange/brown (looks a bit like an octopus but I know I'm being sill there - its very tiny) oh and a stowaway bristle worm - which people say may cause problems if it gets too big. Gonna try and catch it... The new live rock I have is more mature and is soooooo colourful its unbelievable. I have started a diary thread called "diary of my saltwater setup" which I'm going to write everything in if you want to follow what I've been up to...