Welcome to TONMO, the premier cephalopod interest community. Founded in 2000, we have built a large community of experts, hobbyists and enthusiasts, some of whom come together when we host our biennial conference. To join in on the fun, sign up - it's free! You can also become a Supporter for just $50/year to remove all ads and gain access to our Supporters forum. Follow us on Twitter and Facebook for more cephy goodness.
Uh, yes. You definitely need a skimmer on an octo tank. It removes quite a lot of impurity and toxin from the water in short order...you should check out the list under "ceph care" up top to see what all you are going to need!!!