• 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 $50/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.

Water Quality Questions

May 31, 2006
Ok, I haven't bought my octopuses yet, but I'm trying to do some research to make sure everything will be copasetic once they arrive. I have found slightly conflicting numbers for water quality parameters, and I can't seem to lock down a good temperature other than "room temperature." I am hoping to keep O. bimaculoides.

Does anyone know what a good temp. range for keeping O. bimaculoides is?

Also, here are the numbers I found for water quality (the ones that seem the most true in my opinion). I have not yet kept octos, so can someone tell me if I'm in the right ballpark? I want them to live!

pH: 7.8-8.2
Salinity: 35-36 ppt

Apr 20, 2005
ammonia needs to be 0 no buts.
nitrite should be 0
bimacs like colder temps so i suggest maby 72 degrees.
bimacs are pritty difficult to get. Hopefully If my project goes well getting a captive bred bimac will be alot easyer. No promises yet but expect them to be on market in about 4-5 months probably longer.


Dec 22, 2004
Notes on bimac temperature:

The National Oceanic Data Center has a website that lists the average monthly water temperature for a number of different places:

NODC Coastal Water Temperature Guide

For Oceanside, CA--prime natural bimac habitat--the winter low temperature is 57 degrees and the summer high is 69.

Obviously its difficult to keep temperatures that cool in a home aquarium, so most of us shoot for the lower 70s. Remember that increased temperature = increased metabolism = shorter lifespan!