Bagu's answer was so perfect, I rwally think your Teachers nose was sniffing correctly Seffie.
However, it is the true definition and this I hope will not be marked.
Go with seffies suggestion of finding someone who is breaking down a tank to get your live rock, it will work out tons cheaper. If you need it one of us can pm you the name of another forum we use for the classified section, someone is usually selling some on there.
No need to be scared about corals, I was when I started, look at my tank now, almost out of room, thats why I have to get a 6ft tank. I cannot stop it is so addictive. I keep seeing all these new corals and fish I really like.