• Welcome to TONMO, a community of cephalopod experts, hobbyists and enthusiasts. Established in 2000, we are the founders of TONMOCON, and birthplace of World Octopus Day and Cephalopod Awareness Days. ...You can register here, and Introduce Yourself. To rid yourself of ads and enjoy other perks, become a Supporter for just $25/year. (Now accepting bitcoin & other crypto!) ...Follow us on Twitter and YouTube for more cephy goodness.
  • Looking to buy a cephalopod? Check out Tomh's Cephs Forum, and this post in particular shares important info about our policies as it relates to responsible ceph-keeping.

Is a 16 gallon tank too small?


Jul 4, 2008
I've been researching pet octos now for months and someone down the road offered me a beautiful, almost new 16 gallon bow front tank for free. I was anticipating purchasing a 30 gallon, but this tank is hard to pass up. What do you think? If its do'able, what is the best species to try to find for this small a tank?
Sep 8, 2006
We recommend at least 30 gallons for pygmy octos, 50 gallons and up for some of the larger octos.

The larger octos are generally much more interactive, and the pygmy octos are generally very shy and strictly nocturnal.

You might check out this thread: http://www.tonmo.com/community/index.php?threads/9626/

Have a look at the Journals and Photos forum to get an idea of what species people are keeping and what they need.

Latest Forum Posts