• 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.



Jun 9, 2006
My bimac Davy Jones was VERY strong for his size. from my experience, just about all octos seem to investigate around the surface at least once in a while. you might want to put heavy objects on top of the lid, but then it may look "unkempt."
i once saw a documentary (Ultimate Guide: Octopus) a couple years ago that said an octopus can lift up to 40 times its weight. it's probably a bit of an exaggeration, but it's something to keep in mind when trying to keep the little suckers in (pun intended).

May cephalopods be bestowed eternal glory!!


TONMO Supporter
Staff member
Mar 8, 2004
There's a picture I've seen (in Wells, maybe) of a vulgaris who died because it pushed its tank lid up enough to make a crack it almost fit through, but it got stuck at the beak. I don't think this is common (I've never heard of it here) but it does suggest that schemes that only allow a little crack to open can still be a problem.