Interesting. They only live a little over a year. You might want to keep the temperature as low as possible, so maybe you can squeeze a year and a half out of him. Higher temps mean shorter life spans, and this is a temperate species. Since it's a tidal animal, it must be used to temperature fluctuations, however....
The problem here is that, like any of our captive animals, we cannot guarantee success by following nature. We know from keeping reef fish/inverts/corals that the same rules do not always apply in our tanks.
Were I you, I would keep carbon running on this tank at all times, I would keep the temperature in the low 70's, I would not overfeed, and I would do weekly small partial waterchanges to replace lost minerals etc. removed by the carbon AND to keep nitrates low. Why? The carbon will prevent the octopussy from killing itself with it's own ink, but the carbon removes essential elements that he may require. I would assume so, like coral, anyways.. As for nitrates, I realize the website says you may let them get as high as 100ppm, however, reef animals have not evolved to deal with such toxins, and I don't see the point. Plus, this website IS trying to sell something. And trust me, I know ALL about sales tactics :mrgreen: Please use your common sense :evil:
That said, I know nothing about keeping octopussies, so please keep us informed as to your progress
Your experiences will be valuable to those of us who may wish to try keeping one of these fascinating creatures.
And dammit, take some good pics! :wink: