Advice on Flamboyant cuttlefish?

[richofoz]

I currently have a 6'x18"x18" reef tank and would love to keep a flamboyant cuttlefish (Metasepia pfefferi).
The only fish in the tank is a volitans lion of aprox 3"
Will these guys get along?
A friend has been hassling me me for the lion so I can move him if necesary.
I can't find a great deal on keeping them in an aquarium so any info at all would be appreciated. Especially social behaviour...
(I do know they are very poisonous)
Thanks for any help, rich.