wow. this is an old thread.
Ok, Hello and welcome to Aquarium Advice!!! :P
Base rock won't have anything on it but rock. (unless you get it from LiveRocks.com, then you will get some life.)
Live Rock will often contain Mantis Shrimps and these little guys are killers. I would say that definatly your firefish would be in trouble. and The Clowns and gramma's would be in danger too.
But with patience and a keen eye, the mantis can be removed and your fish will be much happier for it.
Hardware: 37 gallon SW
tank and stand by Oceanic Systems, Magnum 350 Pro Canister Filter (half carbon), CPR Bak Pak 2R skimmer, Maxijet 1200 Powerhead, RenaCal 150 W heater, Compact fluorescent lights with moonlights. 40 lbs of liverock, 3" sand bed.
Software:2 Tank-Raised Ocellaris Clowns, 1 Purple Firefish, 1 Electric Orange hermit crab, 18 Blue Legged hermit crabs, 8 or so Nassarius snails, Xenia, Blue, green, and Green Striped Mushrooms.
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Central Illinois Marane Aquarist (CIMA) member.