guys- this is some sort of "scorpionfish sp", scorpaenid is a family name.
These fish are very common in people tanks who keep fish eaters, they are carnivores and usually require live foods to start. If your lucky they will eat small ghost shrimp or guppies. Many of them will eventually wean over to dead mysis, and other meaty fare.
This is NOT a stone fish
Many of these fish remain small and can be kept w/ other fish equal or slightly larger in size.
Just remember that they eat other fish and any small moving invert like small crabs, and shrimp (usually hermits are safe)
If you want to ID this fish, you might have to get scott michael book reef fish vol I, he has a chapter on scorpions and has many photos. The key w/ your fish is the black white caudual peduncle.
As for the Jpg and the nightscorpion listed above they are also family members althou not the same fish, the link provided is to what is described as a Plumed scorpionfish, ands the image appears to be an ambon scorpionfish.
Lastly, read here, a whole issue of reefkeeping magazine on keeping scorpionfish.
http://www.reefkeeping.com/issues/2002-11/index.php
Lucky you
frank
:eek2: 
