Some good points stated above. If you use dry rock and buy a piece of cured rock with no bad critters, there will be a better chance of not introducing things you don't want. Like: Pistol or mantis shrimp, bad crabs, etc.
I myself didn't do this, and can tell you that I have some fairly large crabs, of the yucky variety. So far no issues, but you never know. Also I do have the odd occassion of clicks, thought it was a mantis/pistol, but then thought maybe a crab. Don't know as I never saw what is making the sounds.
This route will mean taking more time before introducing livestock, but you may be happier for doing it.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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