Welcome to TONMO, the premier cephalopod interest community, and birthplace of #WorldOctopusDay and #CephalopodAwarenessDays. Founded in 2000, we are 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. You can also become a Supporter for just $50/year to remove all ads and enjoy other perks. Follow us on Twitter for more cephy goodness.
I heavily recommend going to a good local fish/saltwater store and seeing what they have in stock, so they can advise you on setup. Most of the ceph keepers don't use air powered filtration, as it doesn't have the volume power necessary to keep a ceph tank clean. Have you read the ceph care sheets on Tonmo? If not, be sure to do so...they will answer most of your questions.