Stonefish are rumoured to be illegal in the US hobby fish trade according to Scott Michael in Reef Fishes Volume 1 (pages 488 and 489).
He has seen two species in the trade: Synanceia verrucosa and S. horrida.
The former of the two above can reach sizes of 13.8" and will require a minimum 30 gallon tank. Feeding needs to be varied and not too frequently. The fish will eat anything that will fit in its mouth be it fish or crustacean. This is one of the few gregarious scorpionfish, and a large enough tank will allow a group of similar sized species to be kept together.
The latter of the above grows slightly smaller (11.8") and could be kept as a solitary species in a 20 gallon tank. If kept moist it can survive up to 24 hours without being totally immersed in water.
One thing to beware of with stonefish is that even at small sizes (3" or so) the venom glands are fully formed, meaning even a juvenile can kill you.
Both species are fairly similar in requirements of a small grained susbtrate in which to bury and not too much live rock. S. horrida looks amazing and I will certainly have my eye open for the next few years to see if I can acquire one.
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