Reeferdude:
Allow me to point out the obvious.
There is a major difference betwen getting stung by a scorpionfish and getting dead.
I know you think its makes you Kewl to keep stone fish, but accidents happen. I have a tank w/ lions and have been stung 2 times in 7 yrs. Both times were flat out accidents. If either time its was a stone fish i would be at the hospital wishing someone had antivenom. 99% of the hospital/ER don't, and if your lucky you will only permantly loose feeling the your hand/arm which is stung.
Stonefish also will outgrow and outeat those othe two scorpion. The dwarf will be food intially.
If you want some totally cool scorpions, find someone w/ popeyed seagoblins (Inimicus didactylus), they are 10 time cooler than lionfish, are also poisonous and make stone fish look cute.
If you have a deathwish i say go get those coral sea snakes, at least your guarenteed to be bitten and guarenteed to not make it to the hospital.
frank