Before the Cephalopod police get here, I just want to make sure you know a few things about Cuttlefish.
Their expected live expectancy in the wild is 1 year. So you may see a bit longer in captivity. Most Cephalopods die after spawning. There are a few exceptions, but these aren't one of them.
Finally, Cephalopods are very smart, some even being able to solve and remember the solution to problems that have several steps. Thankfully Cuttlefish aren't Octopi, so you dont have to worry about them climbing out of the tank because the bundle of cords looks like a nicer home then the tank.