Funny coincidence, this is one of my all-time favorite fish and I just ran across a pair of them last week after looking for almost two years. They're a relatively common fish in the wild but extremely hard to find in the aquarium trade.
Anyway, I bought both of them on the spot and put them in separate tanks; one has since vanished (possibly eaten by an anemone) but the other seems to be doing well. They're skittish feeders in my experience so if you can get them eating you're on the way. Sometimes I've had to use live ghost shrimp to trigger a feeding response.
I've had one of these little guys for over a year now and its still as shy (won't feed if it can see you) but will take anything you put in the tank, flake, pellets, frozen...........
The only problem I have had and the reason it lives alone is that it killed a leopard puffer. I say killed as I witnessed the puffer swim near it and then saw the scorp repeatedly stab the puffer with its dorsal spines. I'm not sure if this is an isolated problem or if something else was involved (the puffer seemed in really good health) but it put me off mixing it with anything else.
Mine was thin when I got him but he seems to be filling out with daily feedings. I noticed his gut looked pretty distended this week so he must have caught something on his own (maybe a shrimp) but he's still eating. Seems to like LRS Reef Frenzy a lot.