well yes, but I live in a cold enivronment!!!!!! We just use the water at ambient!! We even have relatives of the antarctic ice cod living in the harbour and our aquarium!
We keep Pinnoctopus cordiformis, Octopus warringa, Sepioloidea pacifica And yes B4 anyone mentions that this is in large public aquarium tanks that's mainly were they are BUT I have kept the latter two in small tanks at home,P. cordiformis gets a little large to keep.