My bimac passed last nov. I am currently getting ready to have another. They are a great experience and a wonderful animal to interact with. I had no need for a chiller, as I keep my house at 69F year round. My octo was 1 year old when it passed and lived an average lifespan.
Sulp, there are many species of dwarf octos that are non toxic. ( Octopus Bocki, octopus digueti, octopus fitchi, octopus joubini,
octopus micropyrsus, octopus parvus, octopus superciliosus,
octopus warringa, octopus wolfi. ) All are 4-6 mos lifespan, but i will warn you that octos are messy and you will need to be aggressive with your mantinance.
Also, not to be a nay sayer, just a word of caution. Most dwarf that are harvested are older, and you may do everything wonderfully, only to have ended up with an octo at the end of their life. The reason I mention, is not to get to discuraged if this happens.