At any rate, keeping an animal capable of such cognition is rather cruel, especially considering how demanding they can be for space, water quality etc.
I firmly stand by my previous discouragement and add to it that you should never, ever, keep cephalopods. It is unethical, unreasonable and selfish. You have more appropriate fish to fry in the aquarium world and if this idea of Cephalopod keeping is met with more than disdain I need to rethink my hobby. Like the time when I received death threats for asking people in my Province to not inbreed their reptiles...least of all to the point of a targeted keratin deficiency.
