
to TONMO!
the octopus care articles in the menu at the top can give you some good general information, but I don't think there's too much specific to cold-water animals. I think
octopus rubescens is the species you're asking about. A few folks have kept them, you could do a forum search for details. They are fairly small, I'd heard them called a dwarf species, but I think they're a bit bigger and longer-lived than most of the dwarf or pygmy species. They seem to be active, interactive, and show a lot of personality, but they also have a reputation of being more likely to bite than some of the other species that can be kept in tanks, and, while the venom is not lethal to humans (unless someone has an allergic reaction) the bites sometimes cause more of a reaction than for other octo species, like a bee sting or so.
Here's a thread on Roy's experience with this species:
http://www.tonmo.com/community/index.php?threads/6067/
(and some unrelated and confusing discussion of cirrate species at the end). A forum search for rubescens will get more info.
Here's another thread on
rubescens that's worth reading:
http://www.tonmo.com/community/index.php?threads/7288/