Thanks for visiting! TONMO is the world's greatest online cephalopod enthusiast community, with interactive content going back to May of 2000, and a biennial conference. If you'd like to join in on the fun, become a TONMO member -- it's easy and free. You can follow us on Facebook and Twitter for more cephy goodness.
Most species that you're likely to find in the trade want relatively warm water. Actual bimacs want it a bit cooler, but they're not really easy to get, so if you order through an LFS or online supplier, you're likely to get a tropical species.