• 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.


  1. J

    Setting up Bimac Tank- Filtration opinions?

    Hello all, I’m in the process of buying equipment and setting up a 60 gal tank w sump for a bimac. I’m planning on buying a good protein skimmer, media reactor with charcoal, and chiller - but I know current thoughts on reef tanks are to stay away from a wet/dry trickle or canister in favor of...
  2. Charlo

    How much is enough filtration?

    Hi there, I am in the very beginning stages of my octopus adventure (I do not plan on owning one for another couple of years). As I am researching, I wonder which is the best way to filter an octopus tank. I plan on having a ton of live rock, a sump, a protein skimmer, and a Granular Activated...