Most Brown Octopus that are commonly available prefer cold water, so an aquarium under 75 F is best. They need crab or other crustaceans in their diet too. They will consume cleaner shrimp, coral banded shrimp, and similar aquarium tank mates. So be careful what you put in the tank with them; especially eels. They are "mortal enemies" of eels.
They are sensitive to nitrates above 20 ppm. So good filtration is necessary as well as a tight lid. Octopus can squeeze through holes about the size of their mouth (which isn't very big). Octopus also have short life spans (often less than two years), so make sure you are willing to part with it earlier than other aquarium species.
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