Octopi are extremely skillful escape artists. As long as their beak can fit through the opening, they can get out. Also, most are nocturnal so you'll rarely see them cruising around your tank. They need to be in a species tank that is set up with no openings so it is essentially escape-proof. Lighting is not an issue but water quality is cause if you have an overflow, it will find it and makes its home inside it and probably go down into your sump.
They are also short lived so don't expect more than a few months, maybe a year from your octopus. In the wild, many species live one year, mate, have eggs/babies, then die.
I had one years ago in a simple 20g setup. It stayed in its cave almost all the time. Could go a week or more without seeing it. Only came out when I dropped in a live shore crab for its dinner. That was admittedly fun to watch. But it lived by itself and the tank was kept low down near the floor in our basement suite to keep the water cool since many species seem to prefer cooler temperatures.
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If you see it, can take care of it, better get it or put it on hold. Otherwise, it'll be gone & you'll regret it!
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