I just got my first lionfish today its a BIG BOY about 6 inches paid 100 bucks for him looks really good in the tank....waiting for him to feast on the the two blue damsels that are already in the tank.
Boisterous little fish will harrass him. The scorpion and lionfish, if your not talking the same fishes, are ambush predators and having them in a small tank they are spotted easily and faster fish will let them know, they know, that they are there and try to run em off.