Keeping one alive and thriving will likely not happen. Octopus are one of the hardest and smartest creatures to keep in an aquarium. If you buy one you better have a good plan on how your going to take care of it in my opinion. Survival rates are so low i would not even waste my money trying. The octopus is smarter and has more time than you. It will kill you, make your wife divorce you, kill itself or break your bank. Just a warning lol.
Also keep in mind deadly animals are best not put on display with access to the enclosure or a way for the animal to get out.
Its no different than owning a loaded gun. You wouldnt want it laying out when company is over. Same idea to think about.
Not saying you cant do it but like i said i would understand 100% what the responsibility is in owning this animal. What can go wrong, will go wrong.
29g Mixed Reef, 150w 14k Phoenix MH w/ Moonlights, Reef Octopus BH1000 HOB Skimmer, Ecotech Vortech MP10es, ReefKeeper Lite (Plus), PH Probe, Temp Probe, ATO, Carbon/GFO Reactor.